Pro Design PD300-YH 

Includes:

• Cool Head Shell
• Head Studs
• O-Ring Kit

Billet aluminum/CNC heads for high performance applications. These state-of-the-art cylinder heads have replaceable combustion chambers for easy tuning, or custom order for your application (altitude, port timing, and fuel, etc.). Up to 70% better cooling, increased reliability, and CAD assisted designed combustion chambers ensure maximum performance. Standard (sea-level, pump gas, standard port timing) combustion chamber sizes indicated.

• CNC machined from billet aluminum.
• Interchangeable O-Ringed domes allow you to adjust compression for fuel quality, elevation, timing or performance.
• Substantial increases in cooling efficiency.