420950772 Head Gasket for Sea-Doo RXP P X 300 1630 2018

Head Gasket for Sea-Doo RXP P X 300 1630

This head gasket (OEM cross-reference 420950772) seals the cylinder head to the engine block on the Sea-Doo RXP P X 300 1630, keeping combustion pressure contained and coolant flowing where it belongs.

Overview

This head gasket is a direct-fit sealing component for the Sea-Doo RXP P X 300 1630, built to hold compression and coolant passages tight under high boost. It suits riders and mechanics replacing a blown or weeping gasket on the 1630 engine platform. The 420950772 reference makes it easy to match against your existing part.

Built For Performance

• Multi-layer steel construction resists deformation under high cylinder pressure
• Precision-cut combustion openings match the 1630 bore for a clean seal
• Coated surfaces help conform to minor head and block surface imperfections
• Integrated coolant passage cutouts maintain proper flow through the head
• Cross-referenced to OEM part number 420950772 for straightforward matching

Fits These Machines

• for Sea-Doo RXP P X 300 1630
• for Sea-Doo RXP-X 300 1630
• for Sea-Doo RXP 300 1630

On-The-Job Use

• Top-end rebuilds after overheating or detonation damage
• Cylinder head removal and reinstallation on the 1630 engine
• Routine refresh during performance builds or engine teardown
• Restoring compression on a used Sea-Doo RXP P X 300 1630

Specs At A Glance

Good To Know

Q: Should the head bolts be replaced at the same time? A: Torque-to-yield head bolts should not be reused, so new fasteners are recommended whenever this gasket is installed. Always follow the factory torque sequence and specification.

Q: Does this gasket require any sealant? A: Most multi-layer steel head gaskets install dry on clean, flat surfaces, though some builders apply a thin sealant around specific coolant passages. Check your service manual before assembly.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.