Re: mill head
The model B head with the letter C is claimed to be only 4.6 compression ratio.It has the improved heart shaped combustion chamber.Check out the Piranio's dyno sheets.
htt://modelaparts.net/dynosheets.htm/dyr The dyno sheet shows that the C head on the stock model A engine gives 6.77 horsepower increase or 46.77 horsepower at 2200 rpm. The C head is thin and I would be cautious about shaving off very much. IF you had an F3 head that also uses the 3 bolt water pump you could shave more because it is a heavier casting but uses the same improved heart shaped combustion chamber. The C and F3 heads are the poor mans high compression head. I have run them in the past and can feel the improvement. The model B had 50 horsepower. The head gave 6.77 of the increase. The B grind cam,B carb , manifold and improved ports gave 3.3 horsepower increase for a 10 horsepower increase over the model A engine
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