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The Cometic Chevy 350/400 Gen1 Small Block V8 Top End Gasket Kit-4.200in Bore-.040in MLS Cyl Head Gasket - PRO1003T-4200-040 is a precision-engineered head gasket with a 4.200" bore and .200" compressed thickness.
The Cometic Multi-Layer Steel (MLS) head gasket is engineered for high-performance and racing applications where OEM gaskets fall short. Featuring Multi-Layer Steel (MLS) construction, this gasket uses multiple embossed steel layers that conform to surface irregularities and maintain a positive seal. Precision CNC-machined to exacting tolerances, this gasket seals combustion, water jackets, and oil passages simultaneously — eliminating the need for multiple gaskets or sealing compounds.
Verified fitment: Buick Century (1977); Chevrolet Bel Air (1970–1975); Chevrolet Biscayne (1970–1972); Chevrolet Brookwood (1970–1972); Chevrolet C10 (1970–1972, 1976–1980); Chevrolet C10 Suburban (1970–1972); Chevrolet C20 (1970–1972, 1976–1980); Chevrolet C20 Suburban (1970–1972, 1976–1980); and 48 more.
Free Canadian shipping on qualifying orders $399+, with no duties or brokerage. Special order and made-to-order items can't be cancelled or refunded once ordered. Oversized items may carry a handling fee depending on your location; pickup in Mississauga has no fee.
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We carry 750,000+ parts, so we can probably still get it. Check the spelling, try the part number, or ask us.
Request this part Text us (833) 691-5717