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Old 01-08-2017, 02:53 PM
yossarian19 yossarian19 is offline
258 I6
Join Date: Nov 13, 2016
Location: Grass Valley, CA
Posts: 402
AMC 401 to 327... yeah..

The 401 in my '75 seems to be junked. I will try block sealer and see if I can eke some life out of it but there looks to be combustion gases entering the cooling system once the engine warms up a bit.
There's a guy with an AMC 327, locally, for $150.
Will the 327 swap in?
Long term I want to LS swap this thing but I just don't have the time, space or money for a project that size right now. I could swap the 327 into place over a weekend, though, and enjoy the Jeep for a few years before going LS (I aim to be in a house with a proper garage by, callit, 2021.)
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Old 01-08-2017, 03:02 PM
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Mikel Mikel is offline
Join Date: Aug 09, 2000
Location: New Haven, CT
Posts: 6,316
You likely have a bad head gasket. Wouldn't that be an easier repair than a -different- engine swap?
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Old 01-08-2017, 03:28 PM
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babywag babywag is offline
out of order
Join Date: Jun 08, 2005
Location: Land of froot loops and cukcoo-nuts, CA
Posts: 9,912
Skip the fix it in a bottle/can, head gaskets/heads are easier than swapping.

The 327 isn't going to work! EVERYTHING is different.
Totally different animal than the GenIII 304/360/401 engine.

Fix the 401, or grab a 360 and swap that.
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Old 01-08-2017, 03:32 PM
joe joe is offline
Join Date: Apr 28, 2000
Location: PNWet, USA
Posts: 22,392
Though I'm a fan of the 327, I'm with Mikel and fix what ya got. The AMC 327 has a different bolt pattern than the conventional 258/360/401 AMC motor pattern so some adapting and mods will be required. Swappable yes. Cheapest/easiest No. If you're planning a future Chev swap anyway, for now just fix the 401. Even if you have a cracked head. 360 and 401 heads are identical and not too expensive. Or even an entire used 360 motor. Save your money for the intended Chev swap and just fix your problem.
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Old 01-08-2017, 06:26 PM
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J20 project J20 project is offline
304 AMC
Join Date: Dec 27, 2000
Location: Nevada
Posts: 2,480
Suggestion? Take a drive down through Death Valley to Pahrump and pick up me good extra 360 and swap it out..At $250.00 you will not swap, change or modify anything and beat that price.

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Old 01-08-2017, 06:50 PM
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brielly brielly is offline
350 Buick
Join Date: Dec 30, 2002
Location: Toms River, NJ
Posts: 1,073
Figure out exactly whats wrong with your current engine before considering a swap. It may be an easy fix, certainly easier than pulling an engine.
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Old 01-08-2017, 07:18 PM
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68glad 68glad is offline
350 Buick
Join Date: Jun 01, 2006
Location: stayton,oregon
Posts: 1,042
A head gasket or something along those lines is simple compared to a 327 or LS swap. No brainer.
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Old 01-08-2017, 11:20 PM
yossarian19 yossarian19 is offline
258 I6
Join Date: Nov 13, 2016
Location: Grass Valley, CA
Posts: 402
Y'know, you guys are right. I'm not sure why I thought it would be easier to pull the engine and replace.
I guess my concern is that it could be a cracked block, though I agree that a simple head gasket issue is much more likely than broken iron. I'll have to investigate further...
Also, thanks for the info that the 327 is a no-go. I'm Expletive Deleted!Expletive Deleted!Expletive Deleted!Expletive Deleted! sure not going to fabricate or problem solve for anything less than a 5.3 (ok, maybe a 4.8)
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Old 01-09-2017, 10:24 AM
wiley-moeracing wiley-moeracing is offline
350 Buick
Join Date: Feb 15, 2010
Location: arizona
Posts: 1,369
and if you are tired of that worn out 401, let me know, thanks ,Tim
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