NotSoFuzzy

so my 4.0L blew the head gasket. rather than tearing it all down, im going to get another 4.0L to put in. this gives me a complete 4.0L extra. my question is this: If i get a 4.2L top end, will it mount straight up to my 4.0L block? if not, what will i have to do to make it work?

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I wish my WIFE liked to get as dirty as my JEEP does
'91 Wrangler YJ

nemmetz92

i'm kinda confused. why go through all the work of replacing the motor. a head gasket on the 4.0L takes maybe 3 hours max. second, why in the world would you put a 4.2L head on a 4.0 block. most people take the 4.0L head and put it on the 4.2L block.

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what the hell did i forget? I shouldn't have extra bolts!!!! Or should I?