f/c drive shaft

what is more common to run in a top alcohol f/c for a driveshaft, 16/32/35 spline shaft?

 

32 spline is the most common by far.
The 16's get chewed up. See em in Cifca cars and that type of thing.
And the 35 is mostly for the fuel guys. There are some alcohol cars that run them, but most tell you it is just spinning more weight.

 

Depends what tranny you run as well. We run the CS2 Lenco in our FC and this tranny has the big 35 fine spline shaft.