87 XJ/4.2 Head ??

Swaping 258 to 4.0, 4.0 parts to 258 etc!
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jsawduste
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Posts: 1032
Joined: February 28th, 2008, 3:13 am
Stroker Displacement: 4.9
Location: Michigan

87 XJ/4.2 Head ??

Post by jsawduste »

From another forum I was asked to answer this question.

89 YJ, 4.2 was replaced with a 87 XJ 4.0 and the 4.2 head and intake were put on the 4.0 block

Have an chance to pick up a 1990 4.0 engine for a great price but I need to know if the 4.2 head will bolt right up and run fine like it does on the 87 4.0 block



If the information is accurate somebody did a 4.2 to a 4.0 head swap on the 87 XJ block...... :huh:

The 1990 engine should still have the 4.2 head (2868) so that should swap over.

Anyone care to help decipher this ? Thinking the info is incorrect as it applies to the head swap.

I've asked for the head casting number.

This is how I read it
87 XJ block/4.2 head swapped on.

Going to a 1990 block/4.2 head on.

.
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