Quote Originally Posted by tcodi
when I checked the total with the vac plugged it would go up to around 35 or so. I liked the way it idled better with the full vac but the guy at summit said I would burn pistons if I used 40 at idle. Obviously as I get on the gas in this case it would drop off quickly and my total would be a little less than that.
Well, you are right about some people saying I can't do it. I guess I'll just play with variations until it works well.


Burning pistons at idle is a new one on me.

More than likely something that never happened.

Nothing against Summit, I like them and trade with them, but like anyplace else some employee's know what they're doing and others are passing along what they think . . . right or wrong.


Got a Motor's Manual?

Do a little digging in there and you'll find both mechanical and vacuum advance curves. (Keep in mind some of the figures listed are in distributor degrees so you'll have to double them for total crankshaft timing.)
A little extrapolation to fit your needs and you'll be in business.