lifters

camshaft duration

What is Camshaft Duration?

Duration is how long the
valve is off its seat. It is listed in degrees of crankshaft rotation. When
someone refers to a “big cam,” they mean it has longer duration, not
higher Lift.Manufacturers often list 2
different duration values:
Advertised Duration is the degrees of
crankshaft rotation that the lifter is raised more than […]

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