Tag: lifters

camshaft duration
Cam Cards

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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