Originally Posted by tcarlx
The truck bucks the starter warm at 16 initial. Is the 22 including vacuum. I am guessing not since u said to run ported. Worth a shot. Thanks for the info.
To allow running the base inital timing that the motor wants with a cam like that, install and use a simple ignition power interupt toggle switch to aid hot cranking/starting. Install the OEM GM starter motor end brace too.
Its just that easy. 26deg inital timing 10deg mech curve 36deg total.
10deg of vac advance for cruising at part throttle.
You will never get it right until you give the motor the generous base timing it needs to idle correctly.