Holley Performance Products Forums

Contact Chris Myer at EFISystemPro.com. He's a Holley EFI parts professional, Holley EFI Dealer & fuel pump/fuel system specialist. Originally Posted by Danny Cabral I wouldn't use a big 340 or larger …

The fact that Holley released new firmware for the Sniper EFI System recently slipped past most existing owners. And while I am not one to recommend upgrading firmware just because it is there, the new …

Jul 6, 2017 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Thus, Holley can not guarantee an …

Aug 17, 2017 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Thus, Holley can not guarantee an …

Oct 5, 2025 · I remember a couple threads where people mentioned refinishing a Holley carb during rebuild, could not find the threads back so I will ask. what kinds of refinishing methods do you use?

Sep 28, 2020 · Holley part number 554-155. Anyone have a good place to find a genuine Bosch O2 replacement sensor without paying $110?

i have a Holley 650 double pumper. this was a problem of backfiring, I bought a kit and I redid everything but still gets this. I tried all possible combos but you can not have the right carburetor. blacks and the …

Sep 30, 2021 · I think you're correct on the vent, as the FiTech swirl pot I used to have installed the vent line was usually dry but would vent raw fuel if the case pressure deadheaded and rose too high. I …

Sep 22, 2021 · Holley Street HP 850 - 1.688" throttle bore, 1.563" venturi (how could that flow the same as above?) Holley classic 1000HP - 1.750" throttle bore, 1.561" venturi (haven't we seen this combo …