just cerious does any body no the air to fuel ratio for a stock 1999 blazer 4.3 vortec? i am getting into tuning my blazer adjusting fuel and spark tables and such i am try to get familiar with it all

 

IIRC, it's 14.7:1 air to fuel.

 

Yep, that is basically the optimum AFR for any gasoline fueled internal combustion engine.

 

thanks again i could not find a damn thing online any place thanks guys