The 6bbls I’ve run on the dyno always used the pretty soft springs, and the secondaries would pop open surprisingly early when opening the throttle while bringing the motor up against the load.
Never bothered to take a reading off the secondary vacuum lines though.
Neither can I nor can i find data ..
either way at 2.5 they start to tip in
And then once when i was really into it , theres was no reading , but boy they opened.
Wish i was a Holley engineer , lol .
After 20 + years of six paks, im gettin there ...
Just playin with springs and makin notes ..
i got this feeling when I put stickier tires on , Ill be doin it ALL over .
