its 10 the engine is a 350 bored 60 over the sound goes away when you hit the gas. and there is vacum on the ported sisde on the carb for the hei. it moves the timeing 2 degrees i think
what are the factory settings for the mixture screws arnt they 1 1/2 turn
Last edited by 78 chevy truck; 10-24-2004 at 02:32 PM.