Hello Again,
I have a Canadian Industrial 313 poly block which I am trying to find and install a block heater into. The frost plug hole (center) is from the outside in 1.625" D for a depth of .200" and then the rest of the way into the water chmanber is 1.350"D
Does this match with the poly USA engines. I suspect that the canadian engines are probably different. Thanking you for your help
Bob