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Unread 10-16-2009, 07:35 AM   #1
webbdad
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1980 CJ5 
 
Join Date: Sep 2009
Location: Alabama
Posts: 23
FI 151 vs Orig 151

My 80 CJ5 has a 151 Iron Duke in it and I am curious if I can pull it and drop in a late model 151 that has FI ?? I would think it would be a mechanically easy swap with the big issue being electrical and fuel delivery. I would go down the path of a donor vehicle for all the parts.
Has anyone completed a swap like this??

Webbdad

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Unread 10-16-2009, 08:36 AM   #2
CSP
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Join Date: Aug 2002
Location: Colorado
Posts: 12,434
The '80 151 is a GM engine known as the Iron Duke. The bellhousing bolt pattern is the same as a small block Chevy. This engine was only used for a few years and was replaced by an AMC 150 (not 151) in mid-83 I believe. This engine is the one that has carried through to the TJ line and uses the same bellhousing bolt pattern as the AMC 6 cylinders and V8.

It's not just a matter of fuel delivery and electrical. There are a number of differences between the two, but the bellhousing bolt pattern is the biggest one.
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Unread 10-16-2009, 08:57 AM   #3
webbdad
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1980 CJ5 
 
Join Date: Sep 2009
Location: Alabama
Posts: 23
Let me clarify. I am not wanting to replace the GM 151 with an AMC 2.5 but rather a late model GM 151 out of a Firebird, Astro van , S10 etc...
Sorry for the confusion.

webbdad
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Unread 10-19-2009, 09:26 AM   #4
webbdad
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1980 CJ5 
 
Join Date: Sep 2009
Location: Alabama
Posts: 23
Anyone have input on this ???
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