1fastRS
15+ Year Contributor
- 79
- 0
- Dec 17, 2003
-
Columbus,
Ohio
okay, first off i've heard this thing about putting a jeep throttle body on the 420A. i know what tb i need, but what mods do you have to do to make it fit, and what kind of gains can you excpect? (with full exhaust (header,high flow, and cat back) , cai, screamin demon coil, and msd plugs) also i'm getting ready to build my motor for a turbo, but i dont know if i should change the bore size or stroke length. is it worth the trouble to do either? also when it comes to the head i know i need new cams, springs, springs, and retainers. what else should i replace? any other pointers are gladly welcomed. this will be my first engine rebuild so i can use all the advice i can get. and one final question... how hard is it to change the head gasket on the 420A? about how much down time can i excpect if i do it my self?