vacuum advance issues

[fleetsidelarry]

Erratic, when the guys mentioned "stock" previously they were referring to a specific set of weight/plate, from a particular vehicle

Originally Posted by crazy longhorn

Dave, was the ign guru, that new the numbers on the weights....but basically, he said pull em ..from a 3/4 ton truck, what you will get, is a far better curve, than you will see on a car dizzy. Me & that old man butted heads pretty hard......but he knew his ****!

FWIW, I finally found my reference to Dave's weight/scroll plate #'s:
"Use from a Suburban, weights marked 41, center scroll marked 375."
and:
"..the 41/375 will give you another 22 crankshaft curve degrees.."
(ChevyTalk post #1449439 - 02/16/06 05:55 AM)

you can use a good aftermarket kit like MSD or Crane to get close to those specs. you can also find those weights and scroll plate on e-bay sometimes