It's possible to determine at what vacuum the power valve opens/closes. Working with the carb top casting (with the power valve actuator and spring in place), I made a small plate with a piece of tubing pressed into it that would bolt over the vacuum passage to the actuator (I think the plate needed to also block off a nearby passage?). Connecting a Mity-Vac along with a vacuum gauge to the tubing, you can observe the level of vacuum that moves the actuator. Then you can change springs until you get it where you want it. [Or- you can make it externally adjustable as I did]
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
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