I was going to up my discharge nozzle size in my Holley 750 4160. Stock size is .025, how far up should I go to try and diagnose a bog off idle (not while cruising)? .031? Setup is in sig.

.031 is a good starting point. When it comes to discharge nozzles, it's one area where it's much better to go too big than a little too small.

Did you change the cam on the carb? Holley offers many different cams which give different profiles and you can adjust a larger pump of gas through the shooter with these. .031 is a good starting point as previously stated, but it is a trial and error process.

Yeah guys I have a cam set and a jet set on the way in the mail as well. Hopefully I can dial in the WOT tip in with these and the new shooter. Thanks for the insight!

I have a very similar setup with a 4150 holley and I went from a 28 to a 37 discharge nozzle and it helped a lot.

Hi

Same kind of set up and carb as well as cam but the only thing I've done is bring down main jets from 70 to 67 and car reacts and performs great with 16 degrees advance , HEI s, vacuum on ported .