420950772 Head Gasket for Sea-Doo Challenger SP 310 1503 2010-2011

Head Gasket for Sea-Doo Challenger SP 310

This head gasket for Sea-Doo Challenger SP 310 with the 1503 engine (2010-2011) is a direct cross-reference for OEM 420950772, sealing the cylinder head to the block to contain combustion pressure and coolant.

Overview

This head gasket for Sea-Doo Challenger SP 310 is a replacement sealing component for the 1503 engine used in 2010-2011 models. It seals the mating surface between the cylinder head and engine block, helping maintain compression and keep coolant and oil where they belong. It is intended for marine mechanics and owners rebuilding a top end on a Sea-Doo Challenger SP 310, and it cross-references 420950772 for straightforward sourcing.

Built For Performance

• Cross-references OEM part 420950772 for direct replacement fitment
• Seals the cylinder head to block mating surface on the 1503 engine
• Withstands the high compression and thermal cycling of marine use
• Composite construction resists coolant and oil exposure
• Designed to match the sealing geometry of the 1503 head
• Sold as a single gasket for top-end service

Fits These Machines

• for Sea-Doo Challenger SP 310, 2010-2011, 1503 engine

On-The-Job Use

• Top-end rebuilds and cylinder head removal on the 1503 engine
• Replacing a failed or leaking head gasket after overheating
• Compression restoration on 2010-2011 Challenger SP 310 boats
• Scheduled or preventive engine service

Specs At A Glance

Good To Know

Q: Can this head gasket be reused if I reopen the engine shortly after install? A: Head gaskets are single-use sealing components and should be replaced any time the cylinder head is removed, even after a short run time.

Q: Do I need to check head bolt torque and flatness before installing? A: Yes, clean and inspect the head and block surfaces for flatness and follow the manufacturer torque sequence and values for the 1503 engine.

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