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I don't know if you can extrapolate from aircooled tech, but VWs (solid lifters) work best with .004" cold, but for the American market they recommended .004" intake and .006" exhaust, and then eventually .006" all around. Because Americans couldn't be trusted to check their valves every 1500 miles. It was a small performance hit.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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