The factory LS steam bypass gaskets can become brittle over time which leads to fluid leakage from the top of the cylinder head. These gaskets feature a rubber and steel construction to maintain a positive seal.

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Proflow Master Cylinder, GM Original Style 67-77, Cast Iron, Natural, 1-1/8 in. Bore, Dual Bowl, Left Port, GM Original Style 67-77

Proflow Master Cylinder, GM Original Style 67-77, Cast Iron, Natural, 1-1/8 in. Bore, Dual Bowl, Left Port, GM Original Style 67-77

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