I have an HEI distributor that I've had since the '80s and I don't know what it came from, originally.
It seems to be a Delco or whatever Chevys had stock.
But I've never been able to set the curve the way I understand that it's supposed to be done, and I finally got around to trying to figure out why. What I have is a distributor that has some really long slots in it that allow the centrifugal advance to move about 32 deg (crank rotation)
I looked and it doesn't appear to be modified or worn out in any areas, Unless someone who is a skilled machinist modified it, I'd have to say it came from the factory that way.
Do you, Cliff or anyone, have any inside info on whether the factory used a distributor with that much centrifugal advance for some application?
I have been setting it at 4 deg with the vac advance disconnected and then with the vac advance on manifold vacuum, that gives an additional 16 deg.
I also have read the post here on dist timing and I could use some OEM springs because what I get is full centrifugal advance at about 2300 RPM
So if springs can be had for that particular HEI unit that will give me full advance at a bit higher RPM, I'd like to order some.
Thanks