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Re: Question for all those on manifold vacuum
You still set initial with vac advance plugged off.
It likely is pinging because of the higher vac advance and the vac pot is slow to move to reduce the timing. Some pots are adjustable. Use an 1/8 inch allen wrench in the vac pot nipple. THey have a spring in them. THe vacuum pulls on the diaphram inside and compresses the spring. When you step on the gas pedal, the manifold vac drops and the spring pushes the diaphram back and your timing drops. THe spring in yours might be set up to be slightly weaker so it's slower to reduce your timing.
You can change pots or make a limiter to reduce how far they move.
There's a number stamped on the arm of the pot to tell you the number of degrees it adds. Unfortuneately it's underneath on the bracket where the pot bolts to the dizzy.
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