Help measure dowel hole in sbc crank

Hi, i need help....

Could someone please measure the diameter of the unthreaded hole in the crank flange for me? sbc two piece rear seal.

Thanks

 

Anyone has a sbc nearby to measure on ?

 

I'll be out in the garage pretty soon. I'll see what I have.

 

Great!

 

Depending on the exact year of the crank, iffen my memory is correct, there are two different sizes. PG vs Turboglide. Probly too old to worry about.

 

I mean the extra hole in between the 6 threaded ones on the flange, not the centre one.

 

Thank You!

 

Beat me. I got 7/16 using a drill bit.

 

Thanks!