Timing

[edison1970]

Took the Cuda out for some tuning today. Bumped the non vacuum advance disributor to 18 degrees,  adjusted the idle mixture screws and off I went. The 440 is strong. Traction is hard to come by. The problem is since I pushed it to 18, it's running hot. My question is would running a vacuum advance distributor help to reduce the temperature? 

[Chryco Psycho]

should be running cooler with more advance did you check the plug color , it could be lean

[70 Challenger Lover]

Running hot at idle, or hot cruising down the highway?

[edison1970]

Plugs still look rich. I might need to put in a fresh plug and run it again. It was running rich before I adjusted the timing and readjusted the idle mixture. I also need to see where my vacuum is at to see if my power valve is correct. 

[1 Wild R/T]

You increased base timing, but did you limit total timing?

[edison1970]

I just did initial, not total. Going to work on it more later this week. I just ordered  some jets, accel pump cams and secondary springs. This will probably be an all day venture next saturday.

[edison1970]

Watched some YouTube videos last night on tuning this Holley carb. I realized the idle was cranked up way too much. Idle mix screws were between 1/2 and 3/4 turns out. I'm assuming that my mains are too small. Does that sound right? I think there is a 72 main and 75 secondary.

[Chryco Psycho]

it depends on the carb size , cam profile , vacuum the engine is making etc , usually there is 8 jet size difference between front & back so front could be too large or rear too small , 3/4 - 1 turn out is about normal for idle mix

[edison1970]

770 Street Avenger.  It was running about 12-13 on vacuum. Lunati 703.