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The Cometic AMC 290/304/343/360 4.140in Bore .027inch MLS Head Gasket - C5674-027 is a precision-engineered head gasket with a 4.140" bore and .140" 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: American Motors AMX (1968–1970); American Motors Ambassador (1967–1974); American Motors American (1967–1968); American Motors Hornet (1971–1974); American Motors Javelin (1968–1974); American Motors Marlin (1967); American Motors Matador (1971–1978); American Motors Rambler (1969); and 14 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