The Cometic Honda/Acura DOHC 81.5mm B18A/B .051 inch MLS Head Gasket/ nonVTEC - C4239-051 is a precision-engineered head gasket with a 81.5mm bore and .051" 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: 81.5mm
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Thickness: .051" compressed
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Part Number: C4239-051
Verified fitment: Acura Integra (1990–2001).