Thread: Cam question
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Old 10-30-2002, 08:56 AM
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Idle quality is based on two biggies:

valve overlap as pointed out by Tom Kirkham, 108=choppy, 112=smooth

The other big determinator is when the intake valve closes. Both cams you listed have near identical duration on the intake side, so if they are installed at the same cam timing, idle quality would be very comparable. You might be happier with less duration if you like street driving, most motors spend more time at 2500 than 7000 rpm.
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