4.0 vs 4.0 vs 3.7

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Jan 15, 2013 | 01:43 PM

#46

lookin2wheel

Senior Member

Joined: Feb 2010

Posts: 587

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From: Barney Georgia

Year: 1991

Model: Cherokee

Engine: 4.0L HO

Quote:

Originally Posted by xj_maniac_newb

I dont think either of them was referring to the GM 4.2, the AMC 4.2 inline six was designed and built by AMC.. Not GM.

Also, the AMC is a 258, while the GM is a 256 IIRC

If you look back in the earlier posts, a reference was made to GM Vortec 4.2L in the TrailBlazers/ H3s. That motor is a DOHC, 24V motor with variable exhaust valve timing. I am fully aware of the fact that AMC had a 4.2L. Again, apples to oranges comparison.

Jan 15, 2013 | 02:33 PM

#47

FlyingLow

Senior Member

Joined: May 2009

Posts: 747

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From: North Jersey

Year: 1996 XJ Sport 2007 KJ Rubicon

Engine: 242 4.0 Ho, 226 3.7 V6

Coming from a guy who owns and wheels both: the v6 has more power overall, but the I6 will last 10 years longer. My current woods project (95 XJ) has 200k and is all original, my weekend warrior (07 KJ) has 65k and needs a valvetrain rebuild.