I can attest to this being a problem. The last 4 rebuilds I have done, the machine shop (two different shops) left so much crud in the water jacket that the rear drain was clogged either partially or completely. Even after I made special mention of this prior to the work being done. I am sure yours will come out fine since you are doing it yourself. Nothing like feeding thick safety wire into the drain hole after the freeze plugs are installed and working to a successful outcome!


Deve

1950 Chevy 3100 Deluxe Cab
1950 Chevy 3100 Standard Cab
In the Stovebolt Gallery
The Think Tank
More info and tips at Deve's Technet