For use with Pro Design’s Cool Head header, the Cool Head Optional Domes are an optional add-on that gives you even more adjustability and performance you can custom tailor to match your ATV and riding style. These replaceable combustion chambers come in a variety of displacements to accurately raise or lower the compression ratio of your engine and provide the performance you want. CNC machined from aluminum alloy, Pro Design build their Cool Heads to give your ATV great performance and a trick look.
Differently sized compression chamber domes
Easily alter compression ratio with different sized domes
For use with Pro Design Cool Head cylinder head
Tune your compression ratio to match riding conditions