i have mech secondayrs and i took out the powervavel and it still stumbles

 

how many jet sizes did you go up when you removed the powervalve? cause that makes it reaaaally lean.

 

Try the part I mentioned previously, it completely eliminated my bog. Now I can just carpet the accelarator pedal w/ no bog at all.

 

hey smurfy i have mechincal secondars not vacuum and and fb i have went all the way up to 68 primary and it still bogs when i stomp on it or should i go highter i got a complete jet kit from 64 to 90

 

i know its been a very long time but did you ever get anywhere on this ?

 

Sounds like he should have increased the accelerator pump nozzle instead. I tuned a holley 750hp for a 383 stroker and after fine tuning the jetting, power valve, accel pump cams and nozzles you could pound the throttle at any point and it would rip.