[My427stang]

Michael Henry - The automakers used short initial mostly for emissions, even when the rules were very basic.

In addition, the stock setup had up to 36 degrees of advance in the dist, and it came in slowly to be able to run on almost any kind of tar available. Take a stock 428 CJ and change the curve to what I mentioned above, and watch it jump, but odds are it wont pass smog like the stock setup would, even worse if you add more initial

We are running into this right now with a roller cammed 351C we are trying to pass smog for Nevada. I took the distributor, gave it a pile of centrifugal (28 degrees, but not in untill 4100) set initial to 6, and put the 195 thermostat in. We havent tested it yet but odds are it will pass. No changes to jetting. A solid roller 250@.050 single plane 351C

It'll run like $hit, but it'll pass because of the hi EGT finishing off any hydrocarbons, then we go back to a quick curve and moderate initial and all will be fun again.