Stumped and Frustrated with a Holley 670 Hesitation

This thread is getting a little long now, and there's great advise coming in. I just want to take a moment to thank all these great members for trying to help out.....That's what makes this site so great, and we can all learn things from situations like this. :thumbrig:


As far as the accelerator pump arm, once the timing is set and the idle speed is where you feel comfortable, then adjust the pump arm to "zero" clearance.....not loose, not tight, but as close to zero as possible. This gives you the most pump shot with the original pump cam that is reasonably mild, but is usually sufficient for anything other then a seriously modified engine. The .015" clearance at full throttle is to make sure you don't bottom out and damage the diaphragm or bend the arm.

I do agree that the Street Avenger's tend to look lean out of the box, but it's hard for me to think that it's causing the dying off at full throttle like you are experiencing.

At this point, I'd like to hear your feedback from double checking your adjustments, and confirming that the ignition side is up to speed?

Good Luck! I'll try and keep in touch with the thread and add anything I can. We're going to get you goin' somehow, count on it...:thumbrig: