Changed using Stone gasket with no coatings applied. Did not fire yet, but after a few weeks noticed beads of coolant and block moist. Appears to be leaking at block side interface on both sides of block, but primarily on plug side near middle. Suspected condensate, but weepage stopped after coolant drained. Both head and block are straight. Using ARP studs. Gasket lifted off block and stuck to head.
Have tried FelPro and stock graphite gaskets and they both weeped. The FelPro actually dripped coolant.
Never had problems with previous design asbestos gasket. It had a pressure sensitive coating that adheared well and did not weep.
I suspect the composite material is not water proof (paper) or does it require heat to seal? Block scraped, scottbrited and wiped with mineral spirits and acetone to dry as prep.
Survey of posts had one where thin film of RTV was applied around coolant passages. Never heard feedback on that procedure.
This seems to be a common problem with the new composite gaskets. Head and block is N42 from '76 280Z
1 What is best gasket to use?
Some have thin fire rings which would not match my o-rings on block (ITW) Others don't have the metal seal for the oil galleys. Have not tried the Beck-Arnley, since both were damaged.
2 What is best coating, if any?
Tried Hylomar with some success. Have not tried Permatex Copper Cote.