Main Jet Recommendations for 602

[DLMDRIVER25]

Getting started in crate late model racing, have the 602 engine, with schoenfeld headers and a stock 650 carb with MSD distributor and box. What is a good baseline for the main jets to start with? What jets should I have in my toolbox for test and tune? Just wanting a good baseline, and other help would be appreciated. New to crate late models but not to racing. Just trying to learn as much as I can.

Thanks,
Stephen

[Chris Steele]

If your carb is a 4777 Holley 650 double pumper, it probably has 68F and 72R. All we done to ours was went up one size front and rear....69F and 73R and has been like that for 5 years without missing a beat.

[DLMDRIVER25]

Yes it is the 4777 Holley, and I will do that and read the plugs and make sure they look good and go from there. Thanks Chris

Stephen