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'86 GN Champ alum. 4.1 L block I'm having a bitch of a time removing the studs, 3/16 hex not doing it, any clues on removing these ? I didn't install these studs, trying to remove to fix fluid leak from heads.

I need to replace a fluid leaking head gasket. Running Champion Alum heads. Compressions all look good. Someone said to use cometic 4.060 bore .040 , I thought 4.040 bore.040 would be the right size. Rookie looking for info. Should I use copper gasket sealer. Heads were installed 10 years ago, I...

I bought an 86 gn with a 4.1 + .020. PT 66, champrails and heads.running 42# inj with 2 Armstrong pumps, meth inj. There are three chips in the console. one has a happy face,one says casper ultrachip ctw87 spl 42. anyone know how to ID these guys.Guessing they need a reader.