CHEVY SB DART LS NEXT RCC COPPER HEAD Gaskets L/R for 1/2" (.530") & 3/8" (.425") studs.
Flatout recommends a "Gasket bore diameter" that is .020 larger than the cylinder bore diameter.
Example: 4.500 Cylinder Bore=4.520 Gasket Bore
CHEVY SB DART LS NEXT RCC COPPER HEAD Gaskets L/R for 1/2" (.530") & 3/8" (.425") studs.
Flatout recommends a "Gasket bore diameter" that is .020 larger than the cylinder bore diameter.
Example: 4.500 Cylinder Bore=4.520 Gasket Bore