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4.0L head differences?


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The later '99 & up 4.0 heads have been known to crack and have smaller ports but the intake alone is worth $50 guys like the later intakes because they make a little more HP. The best 4.0 head is casting number 957120 used from 1991-1995.

 

EDIT:

found the link...

http://www.jeep4.0performance.4mg.com/tech_specs.html

 

2000-01 uses the 0331 casting (the one thats known to crack)

1996-99 uses the 0630 casting

 

I would be a little suspesious of someone selling a 2000+ head unless its from a wrecked jeep its probably cracked but the intake would be worth it.

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