4.0 to 4.0 HO Swap Help!
My 89 4.0 has a nock and the mechanic says he's sure its from a piston. So Im thinking since I can pick up a low milage 4.0 HO long block for around 500 what changes do I need to do? One person I talked with did not think that the intake/ exhaust were the same if this is the case can a 4.0 HO short block be used with a regular 4.0 head?
Thanks for the help
first off dude, if you have an 89 YJ with the stock motor, then you have a 4.2 L engine that has a carb. I don't know anything about the 4.0 vs 4.0 HO, they might be the same thing for aLL I know. If you have the 4.2 the swap to a 4.0 EFI head would be a great swap. Good luck
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