Sierra 18-3874 Head Gasket for MerCruiser 8.2L 502 CID Engines

The Sierra 18-3874 is a precision-engineered replacement head gasket designed for MerCruiser and OMC stern drive engines equipped with 8.2L (502 CID) big block powerplants. This marine-grade gasket provides a reliable seal between the cylinder head and engine block, ensuring optimal compression and preventing coolant and oil leaks in demanding marine environments.

Key Features:

• Engineered for 8.2L (502 cubic inch displacement) marine engines
• Compatible with MerCruiser MCM 425, 450, 465, 500, 502 Mag, 525SC, and 600SC models
• Fits MIE 8.2L Gen V and Gen VI engines (1992 and newer)
• Direct replacement for Mercury 27-811546 and 27-879150139
• Also replaces OMC 3853511, Crusader 31137, and Mallory 9-63703
• Designed for use with Sierra 18-1258 Head Gasket Set for complete cylinder head service
• Marine-grade construction withstands high temperatures and corrosive saltwater conditions

This head gasket is essential for maintaining proper engine performance during rebuilds, valve jobs, or when addressing head gasket failures. Sierra International is a trusted name in aftermarket marine engine parts, offering OEM-quality components at competitive prices.