Will you have to re-time a 1986 2.5 Chevy Celebrity after replacing the head gasket?
Assuming you did nothing to disturb the timing it would not have to be reset just for changing the head gasket.
What entails replacing a 2003 Chevy cavalier transmission gasket Is it expensive or should you do it on my own?
Replacing the head gasket on a 1991 Chevy Cavalier do you need to use sealant on the gasket of the intake manifold and the exhaust manifold?
No, You don't put anything on Head, Exahust or intake gaskets. CJ actually you do put a 1/8'th inch bead of black silicone on the gasket to ensure no leaks occur and it also helps hold the gasket in place when your putting the intake manifold on. I'm a ford master technician, you ALWAYS use silicone when replacing intake and head gaskets. =DK