Pro Design PD308 Cool Head Dome Standard Bore - 22cc

The Pro Design PD308 Cool Head Dome is a precision-engineered replacement combustion chamber dome designed for use with Pro Design Cool Head cylinder heads on Yamaha Banshee 350 ATVs. CNC-machined from billet aluminum, this 22cc dome is designed for standard bore applications (64-66mm) and provides the flexibility to fine-tune your engine's compression ratio.

Key Features:

• Interchangeable O-Ringed domes allow you to adjust compression for fuel quality, elevation, timing or performance
• CNC-machined billet aluminum construction for precision and durability
• 22cc combustion chamber volume for standard bore cylinders
• O-ring seal design eliminates head gaskets and prevents leaks
• Compatible with all Yamaha Banshee 350 models (1987-2006)
• Sold separately from Cool Head shell for custom compression options

This dome must be used with a Pro Design Cool Head cylinder head shell (sold separately). The interchangeable dome design allows riders to easily swap domes to adjust compression based on fuel type, altitude, engine modifications, or performance requirements. Made in the USA by Pro Design Racing.