[Richard in Florida]

Originally Posted by trainguy

Set the inital timing on the dot with vac adv. plugged.Revved, the engine has about 16 deg mech.

With the vacuum disconnected and plugged again, try increasing the maximum mechanical to about 20. You'll get a little more oomph. And if your vacuum is adding 8 degrees, you're right in the ballpark.[/QUOTE]