I installed my 13.6 PA head on my 13 Pro 600 that brad sent me. The machine work is amazing and the install went great. Gained 20lbs of compression on each cylinder with the new head. Now all I need is some snow so I can try it out. Anyone looking for a great quality custom head, give brad at power addiction a call. He has 12.5, 13.1, and 13.6 compression ratios for all altitudes. I have photos of both heads side by side if anyone is interested. Give me a PM with a number and I will text them to you.
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