Anybody know what the diameter of the seal surface on the crank is suppose to be on a big block.

I'm fighting a rear main seal leak and am wondering if maybe the seal surface was turned too small at the factory. I can't make this thing run 20 minutes without spraying oil half way to China! Three different seals now in the last 4 days.

I've pressurized the motor with about 1-1/2 PSI air and sprayed soapy water around the rear seal. It looked like a bubble bath. I could actually hear the air hissing out on one side where the two halves of the seal are suppose to mate up.

Anyway, I measured the diameter of crank at the seal surface, best I could with the motor together and in the car. It appears to be 2.820" and I can't find the factory spec.