If you're pulling anything over 12" Hg then your cam is not too big. Those carbs don't like vacuum below 9". And they don't like excess fuel pressure either; I believe 6 psi max. I tried in vain to tune an AVS on a 7" Hg engine...

You may need more initial timing to start and then a recurve.

Last edited by 64Post; 07/06/09 01:08 PM.