JJONES

502 CARB RUNNING PUMP GAS.WHATS THE BEST TIMMING SETTING?THANKS

formula31

What compression?

Dave F

Around 8-10 initial and 34 total, give or take 2 assuming octane used is proper for the application, as formula31 is implying.

DAVE

formula31

If your compression is below 9-1 and your running marine pump gas~89, you can go as high as 36 but be safe and go 34. If your compression is higher you would want to go 32 or less. There are many other factors involved though.

blown1500

You guys are right!!
The only way to get it right on any combination is to do plug chercks. If you do not know how to read plugs, find someone who does and consult with them. If notheing else, pm me and I will try to help. The best AVERAGE TIMING curve to start with is about what DaveF suggested, but do a SHORT run and check plugs!! This is a time consuming and boring task, but totally necessary!!
Have a great day!!

JJONES

THANKS FOR THE INFO GUYS,THE MOTORS ARE STOCK ,IM RUNNING 91 OCTANE,I SET THE TIMMING AT 34 TOTAL AT 3400RPM TO START OFF WITH.CHECKING PLUGS WILL BE THE NEXT STEP THERE JUST A REAL PAYNE TO GET TO.

formula31

Yea, i know about that, I have to pull an engine to get at plugs. Fortunately, i know my setup pretty well or I thought I did, seems I am misteriously running rich now.