The Cometic AMC 401 for Aftermarket Heads 4.380in Bore .040in MLS Head Gasket - C5409-040 is a precision-engineered head gasket with a 4.380" bore and .380" 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.
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Material: Multi-Layer Steel (MLS)
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Bore Size: 4.380"
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Thickness: .380" compressed
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Part Number: C5409-040
Verified fitment: American Motors Ambassador (1971–1974); American Motors Javelin (1971–1974); American Motors Matador (1971–1976); Jeep Cherokee (1974–1978); Jeep J10 (1974–1978); Jeep J20 (1974–1978); Jeep Wagoneer (1974–1978).