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Old 09-08-2010, 11:33 AM
Adam65 Adam65 is offline
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Straight up timing is defined as when the lobe separation angle and the intake centerline angle are the same. Most racing cams are ground with no advance in them, so if they are installed "dot to dot", that is straight up: a 110 lobe separation cam will be installed at 110 intake centerline. Most aftermarket street cams are ground with 4 degrees advance. If you have a aftermarket street cam with 110 degrees lobe separation angle and put it in dot to dot, your intake centerline will be 106 degrees. You would have to put in a 4 degree bushing and retard it back to 110 degrees intake centerline to be straight up, even though dot to dot is what everyone thinks is automatically straight up timing. It is dependant on how the cam is ground.
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