NOPE, there are 437 different GM OEM large HEI mechanical curves, and just at 20 stock vacuum advances to choose from, and, NO FACTORY SPECS to view.
A couple of things to avoid, if some super tech tells you to weld up the slots, jam a screw in the plate, run, as fast as you can away, they are not the right ways to do it. Also, those after market "curved kits" are NOT FOR STREET USE. They severely stop down the mechanical degrees of advance, and jack the initial to the moon, while removing the vacuum advance, STRICTLY FOR DRAG RACING. The kit spring sets are the only parts kn those kits that are worth having, do not use the weights, center, bushings.
A good combo would be to find a pair of 41 weights, 375 center, use the kit springs, from a Crane 99600-1 adjustable vacuum advance, mount the degrees stop plate the way I outline, NOT the way Crane does it, and go from there.
If you want the FREE, NO ADS info and pictures package on mounting the Crane stop plate, ask for them @:
[email protected]
A couple of things to avoid, if some super tech tells you to weld up the slots, jam a screw in the plate, run, as fast as you can away, they are not the right ways to do it. Also, those after market "curved kits" are NOT FOR STREET USE. They severely stop down the mechanical degrees of advance, and jack the initial to the moon, while removing the vacuum advance, STRICTLY FOR DRAG RACING. The kit spring sets are the only parts kn those kits that are worth having, do not use the weights, center, bushings.
A good combo would be to find a pair of 41 weights, 375 center, use the kit springs, from a Crane 99600-1 adjustable vacuum advance, mount the degrees stop plate the way I outline, NOT the way Crane does it, and go from there.
If you want the FREE, NO ADS info and pictures package on mounting the Crane stop plate, ask for them @:
[email protected]