Thinking of rebuilding 4.2
shepherd1
Jeeper
So I'm thinking of rebuilding my AMC 258 i6 / 4.2l and was wondering how hard it would be to get close to 300hp out of it. I seen some adds of rebuilt motors pumping out 240hp with 9.1 comp and stock heads. I was thinking or using a 4.0L head with porting and 10.1 comp pistons and an aftermarket cam for it. So I guess I should ask has anyone hop up their AMC 258 i6 / 4.2l 's? I've been building Drag racing motors for along time (not the little 400hp motors either, last one built dyno'd @ 1134hp) I know how to build them ,but 1st with this motor.