Originally Posted by roadyrob
the 81 and up takes different manifolds than the earlier motor.
I just got done replacing the head gasket. Installed the exhaust and intake, it leaked (i overtorqued the bolts,
). Took everything off and put on a new intake and exhaust gasket, torqued them correctly and in the proper sequence. Does not seem to leak. It is a '79 4.2 head, but the intake and exhaust manifolds are from an '89 4.2. Any idea what that difference was starting in 81? Cause it seems to be working at the moment...