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Ohh i see i only measured the diameter of the prop which is 8 inches..do you have any idea what prop is good for racing?

So 307 lift is for rpm?how many lbs of valve should i buy?and im planning to buy billet flywheel arc 6603.is it compatible with my cam?

What is the best camshaft for my engine gx390 if i need more speed. Planning to buy 307 lift 260 duration.what does it mean 307rpm camshaft grind?by the way my engine is for boat racing. Direct drive..