[vettestr]

Vac advance is just for emmisions and economy anyhow. I remove from all speed toys any way. All engines love higher advance from stock setings. Each engine has its own personality because of cams,headers etc.. but advance initial timming until it bumps against starter and a few more degrees until it starts to ping when loaded like when low RPMS in a higher gear. STOP RIGHT THERE and remove 4 degrees from that point. That is your max initial timing (say about 20 to 24 degrees) then subtract that number from 39 or 40 degrees total timing and use that number for desired maximum mechanical advance said differently 40 degrees max minus 24 initial is 16 degrees mechanical and lock down the advance plate so it will not move and you have your optimum performance in MOST CASES. If your bumping agianst starter when hot just mash the throttle 1 time before hitting the key. This will flood engine for a nano sec to allow starter to gain RPM clearing its throat before starting. This does not work with fuel injection and computers so do not create yourself problems. But carbed hot rods love it.