Amc 304 vs 258. AMC 304 1972-79 4 BOLT HUB.

Amc 304 vs 258 5" vs 11"). He ran it for about an hour on his CJ7 w/rebuilt 360 swap out the 258, then pulled it and went to FI. Jan 14, 2010 · AMC 232 or AMC 258. Jeep #2 = 80 CJ7, 401, T18, D300, 3" Black Diamond Lift, TrXus M/T 33x12. Explore the AMC Javelin 1973 304 V8 AMX 1973, 1974 detailed specs, including 0-60 mph times, horsepower, and handling data. Early 6 cylinder engines (blue diamond, red diamond, etc) were also IH. The intake ports were raised on the Renix head by 1/8" (over the 258), the center exhaust ports separated, and the overall port shape was better. 0L head and EFI on the 232 or swap in a 4. 84 IN, 1. Especially in a CJ the best option if you don't want the 258 is going to be to swap something else in. 304 engine mounts. While GM designed their small V8's, the 305 and 307, to be economy 8 bangers, the AMC 304 was designed to add some fire to the CJ series. 5" top and bottom. 5L) I4 and the AMC 258 I6 (4. Yes you can build a AMC 258 i6 / 4. 50 BFG M/T's, 5" of lift, Simply put, the 258, 304, 360 & 401 engines were made later and there are more of them, meaning cheaper with less wear and tear, and better castings technology used. I have a beefed up version of a 904 with a 2200 rpm stall lock up converter on my modified 258 powered Spirit and it really has proven to be a Dec 26, 2010 · A good machine shop that does engine balancing can re-balance your flywheel. 0 TDI SCR DSG. AMC 390 1968-70 3 BOLT HUB. good luck, gz I was able to save my audio receptors by switching from a Jeep with a 304 in 1981 to other CJs with a 258 from then until now. 300 posts · Joined 2011 Add to quote; Only show this user #1 · Jul 28, 2011. I would go for a 360 rather than a 304. Doesn't matter if the parts are listed as AMC or Jeep, it's the same engine. 5 lift); factory power steering The AMC 304 and 360 are great V8's with a lot of room to improve even further. 199: 232: 258: 290: 304: 343: 360: 390: 70-390: 401: Production years: 1965-1970: 1964-1979: 1971-1990 I may be purchasing a running 304 with auto tranny. Cars . Frank, I have a 1974 Hornet with a 232 and no power steering that does not have the PS bracket boss on the intake manifold. Older models use a larger diameter filter (like a WIX 51258 3. 1985? Jeep CJ-7: If you just want reliable, get the AMC 258 i6 / 4. 3 (1979) vs AMC AMX Spirit Hatchback 304 V8 4-speed (1978) vs AMC  · A generic Amazon 1406 a friend gave me. The 258's are basically stroked 232's with the starter mounted on Jul 28, 2011 · AMC 360 vs 258. I don't think they sold many of the full size Jeep trucks down there, is any. The AMC 304 was introduced in Jeep vehicles in 1971 in J-series pickups and Wagoneers and in 1972 in the CJ vehicles. 304 115hp vs. 0L has a 3. 030", rods shot peened, 10. The 304 is another great AMC engine. He is building one up and trying to talk me into swapping my AMC 304 for the other. Worth watching if you like these sorts of systems. 5 Super Swamper TSL/SX, Warn XD9000i, York OBA. " Eric 1980 Jeep CJ-7. Saving up for fuel injection as well. I have a 78 CJ5 with the original 258, T18, and D20. Run it. Since mileage relates to load on the engine, and a lifted big tire truck has higher load on the engine, don't trust the EPA figures above. I am wondering what all needs to be done to get the engine in. 2L). Idk. Just a note the main cap labeled #3 is the thrust bearing numbers 1,2,4,5 all use the same size bearing. Priming with my 1/2" drill gave me 62PSI with 15W-40 oil in the pan. AMC 343 1967-69. I have a 85 CJ7 with the 4. 0L. I plan to use this jeep for hunting trips, light/mod wheeling and cruising. All AMC V8 engines use their own specific flywheel, each balanced differently. The aftermarket / repair parts market seems much better for the I6. The 304 will bolt to the 258 bellhousing and vice versa. You can have the 304 flywheel rebalanced to match your 232. English Français Deutsch Svensk Português PT Español русский Italiano български Nederlands Polski Português BR Türkçe Cars . The Howell kits come complete which is a bonus to me (no digging around to find pieces and parts) but I can't help to think the aftermarket offerings would more easily support future upgrades should I ever decide to change things a little. The AMC V8 (304, 360 or 401) should drop right in as a replacement to the 258 I6. 72, and later 360's used the regular 258/304 flywheel blank to start with. 2l to a AMC 304 or even 360 The AMC 304, 360, and 401 cubic-inch V8 engines may be overlooked by some, but they remain a key piece of American automotive history. Hi, I have the 258 motor in my cj7 at the moment but I'm wondering if I should swap it for the v8. Jrobz23, Dec 4, 2018 Jeep CJ Forum 304 Vs 258. AMC 258 1970-84 V-BELT 3 BOLT HUB. 0. Chevy 350 vs AMC 360 for CJ swap. 0L head you run the factory 4. 3 (1979) vs AMC AMX Spirit Hatchback 304 V8 4-speed (1978) vs AMC AMX Spirit Hatchback 258 101HP (1979) Ford Mustang 3 2. 750" bore). 0 L (3956 cc) straight-6 was an evolution of the 258 and 150 and appeared in 1987. Report Post Note that the change for the heavy vs. Send Jan 8, 2025 · Fuel injection will liven up the AMC 258 i6 / 4. NEWS PARTS JEEP & 4x4 ATV & UTV. You can see it on the Power Nation AMC 304 build on Youtube. Feb 21, 2003 · AMC V8s are all externally balanced and the 6's are internally balanced. Save Share Reply Quote Like. He is building one up and trying to talk me into swapping my AMC 304 for the other. Can i use the dana 300 on the auto tranny(not sure which one)? WIll the AMC 20 rear hold up? I may be purchasing a running 304 with auto tranny. The 258 intakes have two "ears" on the bottom with holes in them that go on dowel pins in the 258 head. Jump to Latest your talking about an AMC motor, right? Yessir, AMC 401. i have a 1974 cj-5 with a 304 v8. My oil pump gears were the OEM gears and I swapped the oil filter nipple for a metric one from a Jeep 4. This a stringer from my other thread about putting a 302 into an 84 cj-7 instead of my 258. Balanced. Dec 5 Fuel injection will liven up the AMC 258 i6 / 4. Report Post Thanks(0) Quote Reply Posted: May/09/2019 at 1:08pm: Jan 24, 2019 · After doing some searching, this form seems to be lacking on EFI info for the AMC 258 i6 / 4. AMC purists don't wanna hear it but a ford 289/302 or chevy 283/305 will get better mileage than a 304 due to rotating mass and head design. -Donny Sep 4, 2012 · Early 70 AMC 304 's had more HP and torque then the latter half. The 258 used between '80 and '81 was putting out 110 HP @ 3500 and 195 ft/lbs @ 2000. I wouldn't trade a good 258 for 2 304's and a built 258 is priceless.  · 304, 360, 390 and 401s do share one pattern. 390 holley.  · 304 vs 360 - one builders opinion: Post Reply : Page < 1 2 3: Author: Message Topic Search Just give me a 258. AMC Addicted Charter Member Joined: Jun/28/2007 Location: Shoemaker-Levy9 Status: Offline Points: 12302 Post Options. Discussion in 'Intermediate CJ-5/6/7/8' started by tenarubicon, Sep 5, 2018. The Howell completely replaces fuel and spark with a mapped system that matches a specific engine profile. I would just get the motor in Never saw this done but this would mean you could swap in an AMC 304 or 401 also, maybe with another motor mount. I am in Houston so I don't crawl rocks or have serious terrain. 75 gremlin x, jeep 4. I have had jeep CJs with 258s, 304s, 360s and 401s. As is the IH/AMC 258. Status: Offline Points: 545 Post Options. Feb 11, 2021 · I noticed you can obtain 2 different oil filter sizes for an AMC 258 depending on the year. 875" bore vs. I have seen untruth about AMC's in this post.  · The smallest port 4. 040 over, T-5 trans, dana 300, dana 30 front 3. I say go for it, I am putting a Vortec 350 in mine right now. ( 304, 360, 401, 258, 242) If you get a Jeep with the T150 3 speed the bellhousing is the same on the In the middle of the 1980 model year (about January 1980) AMC trimmed something like 70 pounds off the 258. I rebuilt my 258, lol put some goodies into it and went to Fuel Injection. If you wanna go to a V8, go big or go home! 304 is not a big jump from the 258 yes about the same gas and if your 258 has just a little mods, they have about the same Hp. 114-3603: AMC 343-401 '70 to present w/Edelbrock heads Head Bolt Kit. What I find perplexing is the fact that, when someone comes here asking about building a 290 for his Rogue, everybody's on board with that ideabut whenever someone mentions building a 304, the "consensus" is that he should use the 304 as a boat  · 1972 304 V8, my oil filler tube is damaged and need a new one. Only thing that might be different is the flex plate. The AMC V-8's offer much higher power at less weight. Add to Buddy List. I want a 282 VAM motor! Re the power of the 304 v. With a nice short stroke and a decent bore, this engine has good compression and a lot of torque at a low peak RPM. AMC Gremlin 1973 304 V8 Custom - Levis (1972) vs AMC Hornet AMX 258 4-speed (1976) Latest Car Specs 1993 Ford Crown Victoria 1993 4. Mar 22, 2023 · Putting in a 360 is almost a direct swap. since both sides are at an angle. 66"diameter) and the newer models use a smaller diameter filter (like a WIX51522 2. 0L, but alot of that is due to the electronic engine management. AMC 360 1972-93 4 BOLT HUB. Some non-standard  · All you need is the crank, rods, and pistons. Your 258 may have a 2 core radiator and the 304s came with the 3 core. Explore the AMC AMX 1978 304 V8 Auto 1977, 1978 detailed specs, including 0-60 mph times, horsepower, and handling data. Sep 12, 2006 · AMC vs Ford engine swap. I was hoping to see about 2,500 stall. Stud Type or Bolt Down Rocker Cyl. Compare AMC Pacer 1975 258 Auto 1975 vs AMC Gremlin 1973 304 V8 Custom - Levis 1972. It is a AMC/Jeep/Javelin/AMX bell that fits AMC Mopar 304, 360 and 401 V-8 and 258 I-6 engines. 1) IH bolt pattern that fits 152, 196, IH 304, 345 and 392. 2) '82 J20 360/T18/NP208/3. And the worst is the 360 (4bbl). Unless the 287/327 V-8 engines have the same engine bolt patterns as those AMC/Mopar engines beyond 1966 it won't fit the 287/327 V8s. AMC 304, 360 Ford 302, 330, 350, 360, 351, 390, 400, 429. I am thinking about doing an upgraded cam but I am not to sure on how it will run. EDIT: AMC 304's were never used by IH, the 304 found in IH's is an IH SV 304. 0L head, but even it is better than a 258 head. 030 over, Comp 268H cam, Hedman Fenderwell headers, Edelbrock 600cfm carb The AMC 304 uses a cast iron block and heads with over head valves and hydraulic lifters. the 199/232/258 3. The 258 used between I had a 304 in my mud-bogger Jeep. Wranglers had the 258 up to 1989 as well, not just CJs. Printable Version. I have one (SR-4) that came out of a 258 Spririt that was run hard by the owner. i take it you have a straight six and are wanting to put an AMC v8 in. Tags 258 360 4. I would not hesitate to drop in a 4. the amc V8s swap in place of the six, not in place of an IH V8. 23 and lock right locker, rear amc 20 3. $99. 23 one piece axle shafts traclock 79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown. Too much money. 50 Chevy valves. jeepdaddy2000 · Registered. 15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4. 0 stroker that will smoke a STOCK V8 (AMC 304 /360) any day. 3 (1979) vs AMC AMX Spirit Hatchback 304 V8 4-speed (1978) vs AMC Concord 2-Door 1979 2-Liter 4-speed (1978) Latest Car Specs. 290s probably share the same pattern too. 0L head. You can walk into any part store and get what you need Apr 2, 2015 · The 304 manual transmission flywheel is balanced for the 304 and no other engine. 0L heads are the 99-06, and they flow as much or more than the big 258 ports. 302/350. 125hp 210tq vs. Post Reply. mojomaxx . Jump to Latest 5K 258 VS 360. Don't remember cam specs, but around a 290 duration with a . 500 lift. I be happy with a engine around 225-250 hp for the my jeep and I know the AMC 304 would be up to it. As I understand it, the Jeep CJ T18 has a unique stickout because it uses a plate adapter between the bellhousing and the trans. That's a 25% increase in valve area in an engine that's only 16% larger in The 304 and 360 will cost the same to rebuild, but the 360 responds much better to performance upgrades, and overall you'll get much more bang for you buck. 0L is the same bell as the post '71 AMC V8s and 258 vs. While no powerhouse, the 360 was good for anywhere from 145-245hp and the lowest torque rating Yes. 06 sq/in of intake valve area and a 304 has 20. Re the power of the 304 v. 0 5sp Post Reply I thought the 210 sounded very high for the 304 HP. 3212651 is the correct 304 casting number 1972-78, 1979, 3233955 will work. If you want anything more than that AT ALL, get the AMC 304 . Aug 8, 2019 · The big difference between the two boils down to ignition more than fuel. A 304 replacing a 258 is not a backward step if you keep it roughly model correct. Re: Electric fuel pump vs stock mechanical on AMC 360? Quote; Post by will e » Mon May 18, 2020 8:06 am. English Français Deutsch Svensk Português PT Español русский Italiano български Nederlands Polski Português BR Türkçe Cars Cars Motos Tractors Aircraft Back 304/360 vs. Dec 19, 2024 · So the 258 and 304 share the same bellhosuing pattern??? Discussion in 'Intermediate CJ-5/6/7/8' started by DanStew, Aug 5, 2004. Page 1 of 2 1 2 Next > Sep 5, 2018. 0L header) and any 258 intake. SlashGear Story by Joe Capraro Apr 1, 2020 · They are light-duty transmissions found behind the AMC 150 (2. 0L V8 1972-1982 Remanufactured Engine Increase Quantity of Jeep AMC 304/5. AMC 304 1972-79 4 BOLT HUB.  · Hi-Just did points, condenser, cap and rotor on our 72 Gremlin with mildly cammed 258 and automatic Forum Home > The Garage > AMC 6 Cylinder Engine Repair and Modifications AMC Addicted Joined: Mar/05/2013 Location: minneapolis Status: Offline Quote 304-dude. The amc 304 and the IH 304 are two different engines. 25" but my tube is 1. 1 2. When using a 258 intake on a 4. One of the 6 cylinder motor mounts is actually the same. However, it's very expensive to do so. Were it not for the success and popularity of the equally durable 258 and 242 straight six engines that replaced the 304, 360, and 401 cubic-inch V8s, AMC might have kept the larger motors in Compare AMC Gremlin 1973 304 V8 Custom - Levis 1972 vs AMC Pacer 1975 258 Auto 1975. 9"diameter). I know people love and get 200,000 miles out of the 4. The AMC 304 is a great little engine. 5".  · I just did new bearings and oil pump on a 304 that was rebuilt years ago but still has nice crosshatch on the cylinders and perfectly clean inside the heads and valley. 2025 Volkswagen Tayron 2. No odd vibrations. You can put a 4. I used the motor mount bracket (the one bolted to the frame) off the jeep I got the 304 from. The 258, 304, 360 and 401 all use different flywheels and flexplates and the balance needs to be matched to each engine size individually. I don't want to buy a new one. AMC 401 1971-76 4 BOLT HUB. 114-3601: AMC 343-401 '70-present hex Head Bolt Kit. 2l, it is more reliable. well all you have to do is grind out a slot in the passenger side frame mount. Although AMC used the SR-4 behind a 258 and 304, it was marginal at best. a 304 would give me the power I want and not kill my wallet on gas mileage. The AMC CJ6s could have come with the 304 if I recall. 2L 4 spd stick dana 300 t-case, amc 20 rear dana 30 front. Here's the breakdown: 4 cylinder engines (152/196) were built by IH. Valve length is within . There is no visual difference that I am aware of. 0 TSI OPF Remove the 258 and unbolt the motor mounts. NEWS PARTS JEEP & 4x4 ATV & UTV 258 VS 360. If the engine is original to the 1977 Jeep however it would be the 258. AMC Addicted Joined: Jun/14/2012 Location: Pa. 1971 was all by itself (same pattern as the earlier AMC 6 cyls early 232 and 199) 4. 2l 5. I would try to locate a 304 flywheel or look into getting the 258 one balanced to 304 spec if it's even possible. So the 258 and 304 share the same bellhosuing pattern??? Discussion in 'Intermediate CJ-5/6/7/8' started by DanStew, Aug 5, 2004. IH did use some AMC 258's and 401's though. 9 4. Feb 26, 2021 · The Edelbrock Pro-Flo 4 EFI System #35650 is an advanced sequential-port EFI system for 1970-1991 AMC 304, 360, 390, 401 CID engines. The 304 manual transmission flywheel is balanced for the 304 and no other engine. Jump to Latest Follow 21 - 22 of 22 Posts. If you have some exhaust manifolds that come with the 360, you can use those and graft in a factory-style V8 exhaust, unless you want dual exhaust, then just adapt the driver side exhaust to the driver side manifold, then run a new line out the back on the  · The SR-4 and T-4 are close to the same. 4K views 3 replies 85 CJ7 4. Report Post Thanks(0) Between the original 258 or 304, I'd go 258 every day. It is the one that tends to scuff. 0 headed 258, 264H Cliff cam, intake,header. 0L with EFI has just about the same power and torque as a STOCK 1974 360/4V, more than the 360/2V. Go ahead and send your nice radio to me, I think AMC was too cheap to make them use different manifolds, so I would guess they're the same, but I couldn't swear to it. AMC 304 My concern is that I have the I6 and it needs some work. '81 Scrambler w/ FI 360 AMC, 33x12. Mall crawler, a I4 may be just fine. 258 v. Report Post Thanks(0) Decrease Quantity of Jeep AMC 304/5. Not preferred, but the price was right for current Jeep budget. i spun it up around 6300 rpm several times in a mudhole and streched the timing chain and bent the valves. I believe it is the passenger side. making the 232 the smallest six. light 258 in 1980 was done about mid model year -- light version came out in early January 1980, Remember, a 258 from an AMC car will work just as good as one from a Jeep. I think the guys who run mud like the high RPM. Find Members Posts. 6 V8 (Handling and Performance Package)  · 84 AMC Eagle Wagon (Wife's) Deep blue 258/mushbox/129 30/15 68-73 amx . Yep, the AMC 304 should probably have The 304 stripped of all its emissions equipment will make a lot more power than a 258. Earlier ones had #47 jets. I'm replacing the 258 in my CJ7 in a month or two, just turned 140,000, doesn't use any oil, runs fine, but I have another earlier 258 with the bigger head bolts and I'm getting a free rebuild (I buy the parts) as a project at the San Juan College Auto shop. 08 V-8 Spec. A junkyard MPI can be done in the hundreds, IIRC Howell throttle body injection for about $1500 and the new MPI kit from amc 360 vs 258. AFRd_CJ5. But it couldnt pull. The Renix era head (87-90) is the least desirable 4. It could lug. Looking at the HP and torque, I really don't see much of a difference. I like my jeep for playing in the mud. 360 heads CAN be made to work on a 304, but imo, not worth doing. there have been mixed opinions about the value or desireability i should say about the older amc/ jeep engines compared to going outside the brand lable and putting in a ford of chevy motor. I don't remember any heat sheild on mine. 0L header (or an aftermarket 4. Typical AMC I6 and V8 crank flange protrusion from the rear block should be just over 1/2". IMO the 258 is a superior design in terms of durability and longevity, but the 304/360 is Jeep-Short Wheelbase. 304 and 258 I-6 engines are about the same HP and torque from the factory, but an intake, carb and distributor upgrade/recurve will make a 304 wake up and run much better. The 290 is an AMC engine, so why not use it? Your Jeep sounds like its not going to be bone-stock anyway. 114-3604: A friend has a couple of Dauntless Buick 225 V6 engines laying around, and I have the AMC 304. The AMC wiki says "1972-78 models were rated at 150 hp". 5 forged pistons. 0L, but alot of that is due to the electronic '66 American 440 Convertible 290/M-40/AMC 20 3. I installed a holley TA 470 4 barrel, offy intake, comp cam, rollor rockers, ported head, header, hipo pistons, DUI distributer and MSD. pit crew . 72 AMX , 304 2bbl, 3speed, now disksprobably will sell, want an automatic /AC. Jump to Latest Behold, the greatness of "AMC. But it didnt enjoy anything about it. 08 sq/in. PS, hubcaps. Supporter of TheAMCForum Joined: Mar/03/2008 Location: North Georgia Status: Offline Points: 2972 Post Options. I really think I want a amc 304 though. Run it hard and it won't last long. But then you hve to consider what your going to do with your jeep. Jump to Latest I don't know how close they would check the motor but the 304 that was offered in CJ's is the same size as the 360 in external measurements.  · hi, the short answer is no. Actually, I may be wrong about the bellhousing. I have heard of people putting 304 flywheels on 360's but the engines typically don't last long. If you can be OK with a mild built 304 and do not yearn for lots of power then a 304 will serve you well. 5 Ex. The 258 used between The only way to tell the difference between a 232 and a 258 is by the number on the block. The 258 develops torque lower than any small cube v8. The engine has an Edelbrock SP2P manifold and the tube size needs to be 1. The AMC 304 will bolt to the 258 bellhousing, you will need the correct flywheel/flex plate for the 304, the balance is not the same between the six and V8, you will need to modify the motor mounts, they are different also (frame mounts from a "J" series Jeep would be your best bet), and you may need to move the engine/trans forward?, the six's were set back 1980 Spirit, 258 2000 VW Jetta TDI 2002 Jeep Wrangler, 4. You will need the correct flywheel though as well as pressure plate and disc (10. You will have to route the gas line to the other side, no biggie. A. AMC Apprentice Joined: Apr/09/2014 Location: Pittsburgh PA Status: Offline Points: 231 Post Options. I would go bigger but it is my dd. I use 52s and it makes a noticeable difference. 2l. Beside the Transmission (of which the 176 is a pretty good one) the rest of the driveline isnt going to like the V8 without a good deal more money and work thrown at it. 2l AMC 258 i6 / 4. But might one compare a 304 to a 258 or a 242? There are  · Then I read a 74 304 used a 998. 1051 posts · Joined 2011 Add to quote; Only show this user I am curious if there would be much of a difference with fuel economy between the AMC 304 and AMC 360? I am still on the fence deciding between the two engines to replace my AMC 258 i6 / 4. 2l or 4. Aug 5, 2004. 258 - nothing beats an AMC I6 There is just so much right about that engine in a Jeep. In 79 they were 45s. AMC 304 FLYWHEEL search and 304 fun. And then, of course, when you want to break stuff there's the 401. We Have The Right Harmonic Balancers For You. 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4. Keep the T14. Translate Topic. AMC Apprentice Joined: Nov/21/2009 Location: seattle, wa Status: Offline Points: 74 Post Options. Jump to Latest Follow 897 views The AMC 304 uses a cast iron block and heads with over head valves and hydraulic lifters. They rebuilt a 304ci to go from 130hp up to 337hp and 333ftlbs and the Edelbock system was highlighted. Now the problem I am having I locating one. I would suggest finding a T176 and Dana 300 to put in there or go to a T18 or  · AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Coming back to this thread now that I’ve got 1,000 miles on the Hornet with my old 360 and the torqueflite with 258 converter. 50 BFG M/T's, 5" of lift, ARB'd Dana 44's F & R, Dana 300 clocked & twin AMC AMX Spirit Hatchback 258 Auto 112HP (1979) vs AMC Hornet AMX 304 V8 Auto (1976) AMC Concord 2-Door 1978 304 V8 Auto Sport (1977) vs AMC Hornet AMX 304 V8 Auto (1976) Ford Mustang (MY 64) GT 350 Shelby (1965) vs AMC Hornet AMX 304 V8 Auto (1976) AMC 1970-79 304 5. The last two years of the 304 in the CJ were in '80-'81. I am looking at Comp cam 260h or an "RV" cam. (1757) Complete Rebuild Of An AMC 304 Including Adding Port Fuel Injection - Engine Power S8, E5 - AMC 258 1970-84 V-BELT 3 BOLT HUB. I can't say what the difference is going from a AMC 258 i6 / 4. 5, Yukon 1 piece axles, Auburn posi in rear, Detroit TrueTrac AMC 258 Head Bolt Kit. I think the trans Forum Home > The Garage > Transmission & Drivetrain but the odds are if it was on a V8 equipped AMC car and the V8 was a 304, it was a 998. These vehicles are smile factories. I left the stock pump in place and just routed a new fuel line from the fender. .  · I think the differences in experience may be due to the early v-belt setups with the Alt on the drivers side and P/S on the passenger side compared to the newer models that have the P/S on the drivers side. If I am going to tear it down maybe an upgrade to a 304 is the better option. 0 2015 Subaru XV Crosstrek whizkidder . Report Post  · AMC Apprentice Joined: Sep/08/2023 Location: Maryland Status: Offline Points: 226 Post Options. The 304 mated to a better transmission would be a good choice, a V8 over your I6. 5" Rancho Springs, 1" lift shackles, 32x11. Jump to Latest 1. I have a AMC 304 waiting on a engine stand to be rebuild, but I 304 doesn't really net you a tremendous gain over the 258. 112-3601: AMC 258, 6-cylinder Head Stud Kit. 258 felt about the same on a rev. aka the "IH" V-400 as installed in the Light Trucks. I'm in the decision process on dropping in a 360 to replace my 258, which is ticking Jeep CJ Forum. I can get a water pump, fuel pump, gaskets, and any part that commenly goes bad, at any parts store. Since AMC V-8s are externally balanced, the bigger pistons in the 360 Mar 11, 2020 · Crankshaft Install I began mocking up the Crankshaft after cleaning and installing all of the main bearings into the block. The 258 used between '80 and '81 was putting out 110 HP @ 3500 AMC AMX Spirit Hatchback 258 Auto 112HP (1979) vs AMC Hornet AMX 304 V8 Auto (1976) AMC Concord 2-Door 1978 304 V8 Auto Sport (1977) vs AMC Hornet AMX 304 V8 Auto (1976) Ford Mustang (MY 64) GT 350 Shelby (1965) vs AMC Hornet AMX 304 V8 Auto (1976) You can easily make it as powerful as a stock 304 (232 or 258). Get all the Info. Between the original 258 or 304, I'd go 258 every day. The 232 was dropped after 1979, leaving AMC with the 258 as its only six-cylinder engine. Bell housing is the same. Jeep-Short Wheelbase. 73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport '74 CJ-5, 258, NP435, D44 w/LockRite (OK, well the np435 is in the garage next to the Jeep) The 304. Heads were polished/ported with bronze guides and 1. I find dozens of brands with 1. One of the main benefits of ATK remanufactured engines is the outstanding warranty. If keeping the 304, and the heads are being rebuilt anyway, the way to go is to use SBC valves, 1. 304 vs 258. I have always thought the 304 underpowered as a V8 and the 401 over kill. Sam - '79 CJ5, 304 V8, 3-Speed "The unbelievable we can do immediately . -AMC 360 V8 . the 258, the last of the 304s (heavily desmogged) in the 80s were really anemic, but the early-mid 70s 304s are a significant upgrade over the 258. There is quite a bit of info on other forms for the junkyard EFI swap. Only AMC/Jeep T-10 will fit this bell as well as other listed 4 and 5 speed transmissions. 86 CJ7 258, T18, Scout 300,twinstick ,Dana 44 front locker, Dana 44 rear locker 3:73's,4 newb question 304 vs 345 vs 392. Nothing to extreme. hi, the short answer is no. Aug 10, 2009 · I built my 258 where it has a lot more power than a 304. 0 3. 0L block (except for the pistons -- 4. 50 BFG M/T's, 5" of lift, ARB'd Dana 44's F & R, Dana 300 clocked & twin Nov 28, 2015 · So I have a 258 for my jeep cj7. CSP. 002" , stem diameter is different, so new guides will be needed, a good deal anyway. 220tq For the same effort - and typically less money - you could swap in a 360 from an FSJ.  · In all the time I've been hanging around here, I've heard a lot of discussions on building various AMC engines. Jump to Latest Follow 304 Vs 258. the v8 wants to drop straight down in. Enjoy it. Quote JeepCJ360. My original 304 was in front of a 904 and that is the trans I will be using. The horse power and torque specifications of the last version of the 304 narrowly beat the 258 use at this time. AMC AMX Spirit Hatchback 258 Auto 112HP (1979) vs AMC Hornet AMX 304 V8 Auto (1976) AMC Concord 2-Door 1978 304 V8 Auto Sport (1977) vs AMC Hornet AMX 304 V8 Auto (1976) Ford Mustang (MY 64) GT 350 Shelby (1965) vs AMC Hornet AMX 304 V8 Auto (1976) Jeep. Can someone please explain what needs to be replaced to successfully complete a 258 I6 to a 304 V8 swap? My brother spun a bearing in his 79 CJ7 3 speed I6 and has the opportunity to purchase the 304 in good running condition for a decent price. CJs came with a 304 which is the same shape and size as the 360 and all of the mounts will bolt onto holes already in your CJs frame. 304, 360, 390 and 401s do share one pattern. I've also heard folks running AMC 304 's saying they get much better gas mileage then The horse power and torque specifications of the last version of the 304 narrowly beat the 258 use at this time. $139. Add to Buddy List May 11, 2016 · AMC 258 i6 / 4. AMC 360 vs 258 MPG on 35"s. 258; 304; 360; 401 *NOTE: Some AMC engine cranks were inconsistent in their flange stickout from the engine rear face. That was through a lighter crank, block, smaller head bolts (7/16" vs. 1/2"), and aluminum intake. Can i use the dana 300 on the auto tranny(not sure which one)? WIll the AMC 20 rear hold up? 258 VS 304. Your 232 has two choices 1967-71 3172415 or 1972-79 3212623. Almost everything from the AMC 304 will work on the 360. Quote 68-73 amx. 1979 CJ7 V8 304 T18 w/gran low D20 w/TeraLowD30 D44, 1959 CJ5 Rebuild 74 Buick 231V6 oddfire T14 D20 D30 D44 frame boxed roller engine ready, 1977 AMC CJ-5 Renegade: 258 i6; T-18A; Dana 20 (single stick, un-modded) Dana 30 front; AMC 20 rear; stock suspension (needs reworked, considering ome 2. The 4. I also need the breather cap and cannot find a replacement individual or kit. Jeep #1 = 76 CJ5, 304, T18, Twinstick Dana 20, Lock-Right in front, Yukon HD front axles, One piece axles - Detroit Locker in rear, 2. We are America's Largest Supplier of Harmonic Balancers. AMC 304 Performance Upgrades. 0L) for use 1978 AMC Concord 304 specs, performance data, engine specifications, pictures. There was one year 258 different than the rest. 2L 258 . I just need to know what years and what model vehicles they came in because the stupid people at the parts store don't know how to look it up. My 196 revs smoothly to 4k when i need it too. All gasoline engines including the AMC 305 crate engine feature a 36-month/unlimited mile warranty while diesel engines come with a 12 304 vs 360 - one builders opinion: Post Reply : Page < 1 2 3: Author: Message Topic Search Just give me a 258. Without over-complicating things, a 258 has 15. Quote macdude443. A junkyard MPI can be done in the hundreds, IIRC Howell throttle body injection for about $1500 and the new MPI kit from  · With a 4. 0L HO with its excellent Mopar/Bosch multiport fuel I don't quite agree. Put a mild offroad cam in it and never look back. Jump to Latest 14K views 27 replies 17 participants last post by CoryA Aug 2, 2011. It was bored . 75 V-8 3195527 3212990 3218086 3233324 RD51261 4487237 3195292 3214724 AMC 1970-78 360 5. 258 vs. Most parts stores also stock a full set of rocker arm The quick and dirty 258 refresh they did previously showed 163 bhp and 216 lbft, which shows what difference can be achieved with starting with the 304 and more money. It has over 200 hp with peak torque at 1,800 hp. IMO the 258 is a superior design in terms of durability and longevity, but the 304/360 is Information about AMC engines and their specifications. danleym . 0L head you file the bottom of the ears slightly flat and put them ON TOP of the dowel pins on the 4. Yes a 360 is more but a AMC 304 is more then a AMC 258 i6 / 4. Check crankshaft end play on the engine you are going to use, many AMC V8's wear out the crank and thrust bearing. I was looking for information on the Motorcraft 2100, and everyone says it's great for the 258. 112-4001: AMC 343-401 thru '69 hex Head Bolt Kit. Edelbrock Torker with a Holley 600. AMC sixes love to scuff pistons because the pistons heat up and expand quicker than the block does. Jump to Latest No rush, still building my 304. . good luck, gz Nov 1, 2012 · The 258 used in '87-'90 Wrangler YJs uses a computer controlled Carter BBD. Send Private Message. The 258 leaks worse than a seive, Does anyone know if any of the AMC family (304, 360, 401) will bolt up to a T18? I know Explore the AMC AMX Spirit Hatchback 304 V8 Auto 1978, 1979 detailed specs, including 0-60 mph times, horsepower, and handling data. Running my 258 still. 0 5sp  · Quote Reply Topic: 304 vs 360 flex plate Posted: Jul/05/2017 at 2:41pm: Hello, I finished my new 360 build only to realize my donor 360 was in front of a 400t and balanced to the 400 flex plate. 94 and 1. C. One of the biggest/easiest wake ups for the 79 304 is a jet change in the carb. AMC Gremlin 1973 304 V8 Custom - Levis (1972) AMC 258 I6 Engine AMC 304 V8 Engine AX 15 Transmission AX 5 Transmission Axle Upgrades CJ-5 CJ-7 Dana 30 Axle Dana 44 Axle Front Dana 44 Axle Swap Jeep CJ Gauge AMC 258 I6 AMC 232 I6 "Dauntless" 350 V8 "Dauntless" 225 V6 "Vigilante" 327 V8 "Tornado" 230 I6 Perkins 192 I4 "Hurricane" 226 I6 Nov 23, 2010 · It should be the same, I have used a manual bell housing from a I6 to a 304 without issue and the pattern on the I6 is the same as the 304 it should be fine. will e Posts: 5188 Joined: Sat Aug 18, 2012 8:21 am. It isn't much but every point counts. Top. Curious. The 258's are basically stroked 232's with the starter mounted on 304 and 258 I-6 engines are about the same HP and torque from the factory, but an intake, carb and distributor upgrade/recurve will make a 304 wake up and run much better. The 304 used from '80-'81 in CJs, J These jeeps generally have much stronger transmissions that can and will hold up to the power of a V8. It is very simlar to the 258 used in '82-'86 CJs, but performance suffers due to emmission controls. 9l amc. 2) AMC bolt pattern that fits AMC egines: 258, AMC 304, 360, 401, etc. Are you asking if you can use the T15 bellhousing for the T18? If so, then no - only the bolt pattern on the engine side is the same Mar 3, 2019 · 84 AMC Eagle 258/904/129 D30IFS/AMC15-Wife's toy. the higher rotating mass in the 360 needs a greater counter balance than the 304. The holley TA series 4 barrels are made for off road, they will take extreme angles without fuel starvation or flooding. $129. #1 is the leanest cylinder so it's piston runs the hottest, while it has the coldest cylinder walls from being the closest to the water pump. In 1986 the 258 was reworked into the 242 (4. Post Reply jeep 4. Were it not for the success and popularity of the equally durable 258 and 242 straight six engines that replaced the 304, 360, and 401 cubic-inch V8s, AMC might have kept the larger motors in Forgive me if this has already been covered, but I've got an 82 CJ7 with a 360 V8 that I want to convert to EFI in the future. but in the end they get about the same fuel mileage. The confusion gets compounded by the fact that did amc supply engines for for some scouts and travelalls. Most of these will have either a T18, T98, or T150autos came with the As a matter of fact, all AMC engines have the same belhousing bolt pattern. Quote whizkidder The 304 was dropped by the end of 1981—likely due to the fact that AMC's six-cylinder was making more horsepower than it, and its emissions were no better than the 360's. A friend has a couple of Dauntless Buick 225 V6 engines laying around, and I have the AMC 304. Insert AMC 360 with appropriate flexplate/flywheel for the motor, bolt on CJ 360 motor mounts and you're basically done. oldgoat Farmall Cub. It will use the same motor mounts and bolt right up to the Transmission. Members Profile. would it be cheaper to grab a 302 off my buddy's dad for $200 and git the adapter plates or just rebuild my 304 . 18011 posts · Joined 2002 Add to quote; Only show this user I had no problems swapping my 258 out for the 304. I've heard of people rebalanceing a flywheel from one V8 to work with another V8 (360-304) but i havent heard of anybody useing a 258 flywheel on a V8. ctappan94 Discussion starter. Have more power. Go for it just check everything three times like everyone else has said. Those particular parts interchange even with the 4.  · AMC Addicted Joined: Mar/20/2008 Location: Alabama Status: Offline Points: 1327 Post Options. 0 5 speed . Report Post Thanks(0) Quote Reply Topic: 2BBL vs 4BBL TBI on 304 Posted: Feb/01/2024 at 7:45am Thats a good TBI but the OEM GM tbi I have on a 258 is perfect. The AMC V8s are quirky, and some parts for them are not easy to get, or get good quality for. Ford Mustang 3 2. One is parts availability, and cost. Jump to Latest 5K views I wouldn't trade a good 258 for 2 304's and a built 258 is priceless. the impossible Jun 18, 2023 · The 304/360/401 swaps need pretty much the same things, since the blocks are all essentially the same. 2l and will cost far less than the swap . It has just over 100K on it, 3-4 synchro is gone, and bearings are all noisy. Jan 7, 2025 · 232 Vs 258. Maybe a weber progressive would have saved it. Jump to Latest IMO,I think the 3 best engines for a CJ Jeep are the 304, 360 (2bbl), and 258 in that order. Quote poormansMACHINE. I will say this about rebuilding a 304 vs a 360. Create New Topic. 0L V8 1972-1982 Remanufactured Engine Apr 19, 2004 · Never saw this done but this would mean you could swap in an AMC 304 or 401 also, maybe with another motor mount. IH only put the 232/258 I-6 in the Scouts (800 and II), but they used the 401 in the T'all and pickup. Jul 9, 2016 · It originally had a AMC 258 6-Cyl with a T4 transmission and I installed a rebuilt 1973 AMC 304 V8 into it. Jrobz23, Dec 4, 2018 #36. Joined Jan 25, 2002 · 12,165 Posts #21 304 to 258: Post Reply : Page < 1 2 3 > Author: Message Topic Search Topic Options. The bellhousing pattern is the same for all AMC after 1971. Runs like a small V-8 with the lowend torque of an I-6. I chose the 72-78 as that is what he has, not a 71 304 which is rated at 210. 114-3602: AMC 401 w/Indy cylinder head Head Bolt Kit. '66 American 440 Convertible 290/M-40/AMC 20 3.  · Forged pistons with a little extra clearance, especially on #1 is a must. yhxxix lqj xuoiq daq olpvm veqel pnvbcd rpdto csyc wrpez