Cometic Chevy Mark IV Big Block V8 Rear Main Seal 2 Pc Double Split Seal Wet & Dry Sump 86665 - C5381

The Cometic Chevy Mark IV Big Block V8 Rear Main Seal 2 Pc Double Split Seal Wet & Dry Sump 86665 - C5381 is a precision-engineered gasket kit.

This Cometic complete gasket kit delivers a comprehensive, precision-matched set of seals and gaskets engineered to OE or better specifications. Each component is manufactured from materials specifically chosen for their temperature range, chemical resistance, and compressibility — ensuring every sealing surface in your engine is properly protected during rebuild or performance upgrades.

• Part Number: C5381

Verified fitment: Chevrolet Bel Air (1963, 1965–1975); Chevrolet Biscayne (1963, 1965–1972); Chevrolet Blazer (1973–1974); Chevrolet Brookwood (1969–1972); Chevrolet C10 (1968–1980); Chevrolet C10 Suburban (1968–1980); Chevrolet C1500 (1990–1993); Chevrolet C20 (1968–1986); and 57 more.