I'll admit I never spent much time to try to dial in vacuum advance B/C I have had too many problems with those vacuum cans leaking.
I've run a quick curve for many years and it works all right, but there are improvements to be had that deserve a little more time and effort.
I have heard of overheating and fuel economy problems from not using it, but haven't really noticed much.
Maybe an episode of Engine Masters?
Seems like they run everything locked out?
Idle and WOT power on a dyno: "What else is there?" seems to be the attitude, LOL.
Dulcich/Frieburger both used to stop by here once in awhile, like 20 years ago.
