No,

There are differing diameters for the machining where the torque converter snout is retained with the diameters i mention. It has nothing to do with internal or external balance This machining changed in 71.


It is quite common on rebuilds to find early Pre 71 cranks in up to 79 internal balance engines. If having to replace the crank your machinist will ask what pilot input you need.

My 472 is a D1VE block out of a 78 Merc GM Wagon. It is the internal balance bottom end with a late model EFI top end. When i rebuilt it i specified the small pilot as my torque converter is from an 88 C6. It was cheaper to purchase a 10/10 crank all ready done than have mine freshened up.


All 385 series cranks interchange if you use the correct parts. You can make a 82 460 internal balance by using a balanced crank and the correct flywheel.

Garbz