4.0l head conversion

[Beefy85CJ7]

1049352

Hey,

BEEN WONDERING ABOUT THIS 4.0 HEAD CONVERSION FOR MY 4.2....I'VE BEEN HEARING MIXED FEELINGS ABOUT USING A PRE-1991 HEAD...ANYONE KNOW WHAT EXACTLY IS THE DEAL WITH THESE??? CAN I USE IT? I GOT A HEAD FROM AN 87 CHEROKEE FOR $100 WITH VALVE COVER AND EXHAUST MANIFOLD...SOMEBODY PLEASE ENLIGHTEN ME!!!....ALSO...I'M PUTTING THIS HEAD ON AN 85 CJ'S BLOCK...WOULD IT REALLY HURT THAT MUCH TO USE THE 7/16" BOLTS RATHER THAN THE 1/2"...I REALLY DON'T FEEL LIKE HAVING THE BLOCK RETAPPED FOR THIS....HELP!

[addsig]

 

[allabs5150]

1049383

From what I undestand you would want to use the 91 or new 4.0 head because they are the hi-port HO head, but i think you could use any year you wanted if you had to, but you would get the performance outta the 91-up head[addsig]