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Cometic rear main seal for Chevrolet Gen-1 small block V8 (1955–1985) is a two-piece Viton seal designed for align-honed 400 and aluminum blocks. The fluoroelastomer material provides superior heat and chemical resistance, and Cometic's dyno and assembly checks support the seal's durability and OEM-quality fit for classic Gen-1 applications.
Cometic Chevy 1955-1985 Gen1 Small Block V8 Rear Main Seal-Align Honed 400 & Aluminum Block-2 Piece
