304 to 401? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-28-2002, 09:35 PM
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304 to 401?

Ok, First off will a 401 bolt directly in a 76 CJ5 with a 304 and T-150's place without any mods? I ran across a great deal on a 78 Wagoneer that only has 32k original on it but the frame and body are shot. Excellent drivetrain! Would this be a worthwile conversion from the 304 as far as horsepower gains,etc. I know in 78 or round about is when they started using the undersize pistons,etc to keep vehicles emissions friendly. So I don't know if the 401 would be worth getting unless I built it from it's current stock form. I know my 76 304 is pushing 150 HP in it's stock form so any guesses on what the 78 401 would be pushing. I would just like to know the pros and cons of this swap before I go shelling out anymore greenbacks.

Bowlsie

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post #2 of (permalink) Old 02-28-2002, 09:49 PM
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Re: 304 to 401?

Yes, externally, the AMC V8's are the same. All your accessories will bolt to both engines, including the exhaust manifolds. I believe the wagoneer driver side manifold will exit too close to the firewall to use in the CJ.

Also, if the wagoneer had an auto trans, you'll need a flywheel.
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post #3 of (permalink) Old 03-01-2002, 07:38 AM
 
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Re: 304 to 401?

The 401 will work fine in either stock or modified form. I believe they make about 210 hp stock, (but don't quote me) The biggest problem with building any of the AMC motors is $$$. You can build a comparable GM 350 for 1/3 to 1/2 the price of building an AMC. We built a 350 hp 360 for my last jeep and had almost $4000 in it when we got done, where as, I built my current 275 hp 350 for under $1500. I realize that I ended up spending about another $1000 to make the 350 fit my Jeep, but it's nice to know I can walk into any parts store and expect to find any part I need for it now. Just my $.02.

89 CJ/YJ thing 350 TBI, 700r4, NP231 SYE, 3 inch body lift, 4" superlift, 33's and an appetite for mud!!!
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post #4 of (permalink) Old 03-01-2002, 08:21 AM
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Re: 304 to 401?

Yea they will swap out exactly. I just helped a friend swap a 360 in place of his 401 in a wagoneer and we had no problems. I'd want the 401 over the 304 because there is no substitute for cubic inches.

My girlfriend said if I spent one more dime on my Jeep she would leave. Man I'm going to miss her!
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