420950772 Head Gasket for Sea-Doo GTX STD 300 1630 2021-2026

Head Gasket for Sea-Doo

This head gasket, part number 420950772, seals the cylinder head to the engine block to maintain compression and keep coolant and oil where they belong on 1630 ACE engines.

Overview

This head gasket for Sea-Doo is a direct-fit sealing component for the 1630 ACE engine used in GTX STD 300 models. It seals the mating surface between the cylinder head and block, holding combustion pressure and separating coolant and oil passages. Built for riders and mechanics replacing a blown or leaking gasket during top-end service.

Built For Performance

• Multi-layer steel construction for reliable sealing under high compression
• Precisely cut coolant and oil passage openings for correct flow
• Withstands the heat cycles of a supercharged 1630 ACE engine
• Designed to match OEM part number 420950772
• Compressed thickness suited to factory deck height and torque specs

Fits These Machines

• for Sea-Doo GTX STD 300 1630, 2021-2026

On-The-Job Use

• Top-end rebuilds after overheating or gasket failure
• Cylinder head removal and reinstallation service
• Compression loss diagnosis and repair
• Routine engine refresh on high-hour 1630 ACE powerplants

Specs At A Glance

Good To Know

Q: Can I reuse this gasket if I remove the head? A: No, a head gasket is a single-use item and should be replaced any time the cylinder head is removed. Reusing one risks compression loss and coolant leaks.

Q: Does this fit both the 300 and 230 versions of the 1630 engine? A: This gasket is listed for the 1630 ACE platform, so confirm your exact model and year before ordering. Serial number checks help avoid mismatches.

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