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Old 01-05-2013, 08:05 PM
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.. A micrometer can be used to measure the diameter of the cam at base circle and max lobe lift... subtract base measurement from lobe size to get cam lift... do it for intake valve lobe and exhaust valve lobe... multiply those numbers by 1.6 to get valve lifts, which will likely give you a good idea of the cam size... those lifts prolly match up to a standard cam of some sort... and the standard cam will have known durations...

.. A rebuilder's info would only be accurate if no one had made any subsequent changes...
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