Out of all the 383 cranks all the ones I have seen are externaly balanced.
I want a internaly balanced one, does any one make them?
If there are 0 balance cranks out there how much more are they?
I don't care for the external balance stuff ( see the internaly ballanced 88' 2.8 motor in my 85' camaro).
Also, when did GM start balancing 305 and 350'?
Was it 87'?

 

Scat makes them. Here is an example of a kit that uses it:


http://www.pmeracing.com/triton/engc.../sbc-33832.htm

I think scat lists a different crank for 6" and 5.7" rods. I guess balance on these is that critical when going to internal with the longer stroke.

Sbc's have always been balanced from the factory.