I believe the only HEI's that did not have centrifugal advance were the computer controlled ones.
I have had a couple 1975 external coil HEI & 1978 internal coil OEM, that both have centrifugal advance.
The problems with HEI over time they are neglected & never get taken apart for cleaning & re-lubing & the centrifugal advance mechanism gets stuck & they will not give any mechanical advance.
Just a F.Y.I. I have used standard springs w/one taken off, I have used aftermarket spring kits & have used one spring instead of the two.
Using the aftermarket lightest spring & only one spring does not allow the advance mechanism to return back to 0 advance (too light)
Using a stock spring & only one stock spring is too tight, the advance is slow & does not work as well as the aftermarket spring kit.
When a person is wanting to rebuild a distributor, why give sub performance information? Stalker, quit following me & unless you have useful information stay away from my posts, make up your own post in your own builds, o- forgot, you don't have any builds.
MBHD
