420950772 Head Gasket for Sea-Doo GTX S/C 1503 2003-2006

Head Gasket for Sea-Doo 420950772

This head gasket for Sea-Doo 420950772 seals the cylinder head to the engine block on the 1503 engine, and the part number matches the OEM cross-reference for the GTX S/C 1503 built from 2003 to 2006.

Overview

This head gasket for Sea-Doo is a sealing component that sits between the cylinder head and the engine block, holding compression and keeping coolant and oil where they belong. It is made for riders maintaining or rebuilding the 1503 engine in the GTX S/C 1503 from 2003 through 2006. The 420950772 head gasket for Sea-Doo is a direct-fit replacement for the original sealing part.

Built For Performance

• Precision-cut to match the 1503 engine bore and coolant passage layout
• Reinforced composite construction for a durable compression seal
• Withstands the high cylinder pressures of a supercharged 1503 engine
• Resists heat cycling and coolant exposure across long riding seasons
• Cross-references OEM part number 420950772
• Installs with standard head bolt torque sequence for the 1503 platform

Fits These Machines

• for Sea-Doo GTX S/C 1503, 2003
• for Sea-Doo GTX S/C 1503, 2004
• for Sea-Doo GTX S/C 1503, 2005
• for Sea-Doo GTX S/C 1503, 2006

On-The-Job Use

• Top-end rebuilds after a blown or weeping head gasket
• Cylinder head removal and reinstallation on a 1503 engine
• Routine maintenance on supercharged Sea-Doo watercraft
• Compression restoration on high-hour 1503 engines
• Seasonal tear-downs where sealing parts are renewed

Specs At A Glance

Good To Know

Q: Should I replace the head gasket on its own? A: It is best practice to fit a new gasket whenever the cylinder head is removed, and many mechanics renew head bolts at the same time. Q: How do I confirm this gasket suits my watercraft? A: Match the 420950772 part number and the 1503 engine code against your machine before ordering, since fit can vary by configuration. A: Always verify the engine code and model year on your hull plate before ordering.

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