Hey Hoppy, I tried every combination today on the vacuum advance. I need to buy a vacuum pump or just suck on the hose and put my tongue over the end to test the diaphragm. (damn, that sounds gross doesn't it) Nothing I did makes any difference. It still pings the same. I just plugged the vac line with the same results. If I remember, when I installed the Pertronix, I took out the heavy long slot spring and put in the Mr Gasket spring Way too light for a auto car I bet.:BangHead::BangHead::BangHead: Today, I backed the initial off from 15° before to 10° before but I still had the same amount of ping. Total was at about 35° at 2500 rpm.
