What kind of engine big block or small block?

I had the same thing happen with my big block and I installed a 1/2" split collar on the distributor shaft just about the intermediate oil pump/ distributor drive gear. This holds the drive gear down and keeps the distributor from moving up and down which changed the timing.


4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight