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Old 11-25-2011, 01:34 PM
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Originally Posted by kennyhammond
money is tight so the cheaper the better and it is going into a 81 chevy c10 t350 transmission and 2.72 gears just a truck to drive to workand have some fun with
If you're going to keep the 2.72 gear, then you will need to go easy on the cam, very easy. Going easy on the cam means going easy on the static compression ratio. I believe these motors were somewhere between 8.5:1 and 9.0:1, so will not tolerate a lot of cam. The stocker is probably the best cam you could use, particularly with the tall rear gear. Surfing around on the web will reveal that the stock cam was probably in the area of
192 intake/197 exhaust degrees duration at 0.050" tappet lift and 0.404"/0.414" valve lift.

This chart will tell you the range of cam duration to use with the static compression ratio of your motor.

Bottom line, I'd leave the motor stock until you decide to upgrade the rear gear to a performance number and change pistons to raise the static compression ratio so it will support more cam.
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