The power valve in the bottom of the float bowl would never open if there was no spring. Remember, vacuum pulls the rod off the power valve against spring pressure. It takes 10-20 grams of force to open the power valve. The stock power valve rod has a 150 gram spring, which we often modify to 80 grams by removing about 8 coils.
If you had no power valve, acceleration would be as though your engine was always cold--too lean. Try it to confirm whether the power valve is causing the "bucking."
__________________
BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
|