[Lloyd-TX]

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Randy Frazier:
I have found that most HEI distributors have too much vacuum advance built into the diaphragm. The number of degrees is stamped on the bracket that attaches the unit to the distributor plate so you can check and see what you have.<HR></BLOCKQUOTE>

Hey Randy:

Just a heads up on you comment concerning the stamped number on the vacuum advance bracket. I used to think that was the degrees rating on the unit as well, but as you can see in the article linked in my post above, that number is actually an identifing number stamped by the manufacturer (Dana Coroporation), and has nothing to do with the number of degrees of advance. For instance, the unit I'm using is a Standard Ignition part number VC 177, and is stamped "B28", yet provides a total advance of 8 distributor degrees (or 16 crankshaft degrees). I've verified this with a dial-back timing light when installed on my engine.

Hope this helps.

Later,
"455HO" Lloyd

1972 Formula 455HO; Lucerne Blue; 12.96 @ 104 MPH @ the '03 PSN's; 12.50's or bust this year!
1970 GTO 455HO; Palomino Copper
1972 GTO 455HO; Sundance Orange