Neat little Powerglide, no cooler lines just 4 large holes in the bellhousing. I have never seen that before.
The torque converter should also have 'fins' on it to help with cooling. The holes for an external cooler are also on the tranny, just plugged.
Was there a 13 inch flywheel by chevy and what would they be on?
I have one that measures about 12.75." It came out of an early Nova ('64 I think). I tried to get a part number off of it for you, but the 4th digit is hard to read.
379x366
it might be 3799366 or 3790366.
