Sierra 18-0488 Marine Intake Manifold Gasket Set

The Sierra 18-0488 is a marine-grade intake manifold gasket set designed for GM V8 marine engines. This gasket set provides a critical seal between the intake manifold and cylinder heads, preventing vacuum leaks and maintaining optimal engine performance in demanding marine environments.

Key Features:

• Includes both side intake manifold gaskets for complete installation
• Marine-grade construction designed to withstand harsh saltwater and freshwater conditions
• Direct replacement for Mercury Marine part number 27-807473A1
• Also replaces OMC 3857662, Volvo Penta 3857662, and BRP 3856394
• Does not include distributor mounting gasket or end seals (use RTV silicone gasket maker for end seals)
• Engineered to meet or exceed OEM specifications for proper fit and long-lasting durability

This gasket set is specifically engineered for MerCruiser 350 Mag, 5.0L, and 5.7L/LX Gen II Vortec V8 marine engines from 1996 and newer. The precision-cut gaskets ensure proper sealing to maintain engine vacuum, prevent air and coolant leaks, and deliver reliable performance season after season.