Have a 383 with a Scat one-piece seal crankshaft. Last spring I tried various combinations of aftermarket pulleys for this setup and was unable to get proper alignment due to the Scat crank snout being shorter than normal.

Anybody have any experience with the Scat crank and what pulleys will line up right on this?

Can't spacer the crank pulley out as the snout only has so much meat.

Did you replace the balancer? Since the crank pulley is mounted to the balancer, is the balancer installed properly?

I have had problems with the Scat cranks not having the keyway cut deep enough.

Make sure the balancer went all the way on. Timing gear also.

INFOmaniac your right they,re known for not doing good machine work all the time !!!