Holley 770 jet sizes on 440

[69dart440]

I recently installed a wideband O2 sensor and gauge on the car. The motor is a 73 440 with headers, 3"exhaust, mild cam, aluminum intake and holley 770 street avenger with vac secondaries. So far I have #71 jets on the primary and #69 jets on the secondary. I'm seeing 12.3 to 12.6 during WOT runs. Does this all seem normal to you guys? It just seems like #69's are on the small side from what im seeing other people running. Trying to get ready for the track this weekend. Thanks for any input!

 

[70aarcuda]

are you running power valves in the primary or secondary.....?

 

[crackedback]

pump gas w/ 10% ethanol blend, sounds pretty close.

 

[69dart440]

Is has a 6.5 power valve on the primary and none on the secondary. Yes, the gas is 10% ethanol. Thanks guys!