[scott.k]

hello,
I think my dizzy vacuum advance is fried, the porsche shop that i took my car to a while ago said it was, and at smog the guy said it wasnt advancing properly. But it might be the rotor spring or something else, and I would like to check those out first.

1) what should I check first?

2) can anyone tell me what the 911 sc dizzy vacuum advance part number is?
if its NLA, then if people could tell me what other parts might work in place of it. there are lots of new advances for VW dizzys and other cars that look identical and seem like they would work.

thanks
scott