I'm thinking of the pro topline 50cc heads for my truck. 355 8.5-1 comp now but going to the 50cc heads your talking 10.5-1 or more. I was thinking of getting them for my race car and still might because with a flat top piston you get a better burn rate for fuel and with the small chambers you can make 12.5-1. For like 400 you can get the haeds and buy a kit with valves and everything for 125 and have less than what they want for an assembled head provided you know how to put them togather and have the tools.
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