Cometic - C5681
Rear Main Seal - 2-Piece - Rubber - 400 Block - Align Honed - Small Block Chevy - Each
Chevrolet 1955-1985 Gen-1 Small Block V8 Rear Main Seal, Align Honed 400 & Aluminum Block, 2 Piece
COMETIC Viton is a fluoroelastomer, or high end rubber. Top of the scale for heat resistance, chemical resistance and durability. Viton with Larger 2.841" O.D.