Movement of the piston creates a pressure drop across this window. In fact, the relationship between piston movement and valve movement can affect net cylinder filling (volumetric efficiency or VE).
Q:I have a 327 in my '31 Ford that features nearly the same cam and components as the one you referenced recently in Pit Stop (Nov. '12). Since a 1.6:1-ratio rocker arm will push the valve a little ...
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