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Duration is the amount of time in crankshaft degrees that the valve is open (at a specified amount e.g.: .053"), while the lifter is in motion.
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An increase in compression ratio or a decrease in camshaft duration will increase cylinder pressure.
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Lift helps produce torque and horsepower (up to the point at which the heads no longer flow effectively).
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Overlap of thirty degrees or less normally produces the best low end.
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The tighter the centerline the shorter the power band; the wider the centerline the wider the power band.
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When installing a new cam always put a thin coat of a non-moly type assembly lube onto all machined metal surfaces and install a new Torrington bearing. Check cam cover to case alignment, as well as cam bushing and bearing fit, and check tappet rollers for any unusual wear and replace as necessary.
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Cam end play should be no less than .003 and no more than .015.
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Always check cam gear to pinion gear fit.
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If the cam gear pitch is to tight to the pinion gear pitch, the gears will produce a whine. If the gear pitch is too loose it may produce a sound similar to lifter noise.
