1998 Vortec Timing Table (Black Box Computer) Open / Closed Throttle ONLY!

[PJG1173]

Good heads with a fast burn chamber and tight quench will require less timing. People seem to think more is better when it comes to advance but the goal is to make the most power with the least amount of spark advance. When you start spark advance before TDC some of the energy from combustion is wasted as increasing pressure tries to prevent the piston from achieving TDC.

I'm still waiting for the day when in cylinder pressure sensors are part of the hotrodder's tuning arsenal.

All things being the same except the cam i run 33* on my other motor with about 10* less duration. I think the bigger duration cam gets more cylinder filling raising the dcr, and coupled with a tight quench and fast burn chambers is what
is reducing the need for timing.