:+2:are you still getting beat by them odd sounding motors. Rule 1 get all the compression you can get, take the bumps out of the ports, intake especially, and double check and tripple ck piston to valve clearance. The book says 10 degrees before or 10 degrees after, spread it out to about 14 degrees and work to 5 degrees checking every degree of crank rotation for clearance. I use acouple of light weight hardware store springs and only use the # 1 cylinder valves at the very end of the head. You can mill head .015 and have plenty of room. .020 if you are brave with the thinest head gasket you can get. That will set your squish at just a little less than minimum.
These guys are pretty smart and this is a great place to come for info. By the way find the factory race manuel in the sticky and store in in your computer.
Is that .007" inch or .070" inches or .07 mm? At .070" I would bet you had p to v problems. squish is determined by piston deck height and head gasket thickness.With .07 or so milled off my head. A .018 hg p to v is .050 & .070 at 107/103
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