Oldsmobile 400 425 455 188cc 77cc Aluminum Bare Cylinder Head

All Speedmaster 18deg. Oldsmobile heads are available with OEM sparkplug location. Standard valve sizes are 2.072 in. Intake and 1.680 in. Exhaust. INTAKE GASKETS: _x000D_ Our heads are manufactured with both the conventional intake manifolds. _x000D_ PCE349.1011 _x000D_ _x000D_ EXHAUST GASKETS: _x000D_ We recomend the use of our Exhaust gaskets, PCE355.1001, on our 18 degree heads. _x000D_ _x000D_ PUSH RODS: _x000D_ Our aluminum 18deg. heads typically use +.100" (longer than stock) pushrods. Depending on the components used, it maybe that possible that you may need pushrods shorter or longer than that so we recommend that you use an adjustable pushrod to dial in your rocker geometry and order pushrods to match.