Help tunning Holley 600

[David Fulford]

Well the 2 screws on the front of the carb are the mixture screws. I think they are also refered to as the fast idle screws.(may be wrong on that one) As far as running lean, this can cause your engine to be hot and of course running rich can cause plugs to foul etc. How to find the optimum mixture I still don't know without some sort of oxygen sniffer in the exhaust. A basic rule of thumb is to get the car running, turn the screws clockwise, until the engine runs rough and then back the screw out about 1/2 to a full turn. Do the same on the other side. Turning the screws clockwise makes it a more lean mixture and turning them counter clockwise makes a more rich mixture. Someone else on here probably has way more knowledge than me but this is my $.02. Good luck with it.

------------------
1969 fast back; yellow; weld wheels; 302 roller with GT-40 heads; 3:55 gears; 5spd T-5; MSD 6AL; E-303; flows; Hedman headers;