Thread: cam choice 347 Windsor
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Old 06-06-2007, 07:00 AM
blykins blykins is offline
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The advertised duration is the duration that the valve is open from seat to seat (or around .005-.006" off of it). The duration at .050" is the duration from .050" off the seat back to .050" off the seat.

Some cams will be closer than others. The ones that have adv/.050" durations really far apart will show a lobe that will have quicker valve lift acceleration starting at .050".

A lot of hydraulic roller cams will have a large advertised duration but a short duration at .050".
Last edited by blykins; 06-06-2007 at 10:49 AM..
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