Re: Frost Plug holes in the 313/318 Poly Block

["Gary H." <62to65mopar@xxxxxxxxxxx>]

I assume actual block is the same (except bore) so here is some data from the Technical Tips and Links page that may help:

"The early Poly engines from 1956 to 1962 use the “dish-style” 1 5/8 inch brass freeze (core) plug, #565-023 Dorman, and the later 1962 to 1966 Poly 318 engines use the “cup style” 1 5/8 inch brass freeze plug, #565-068 shallow cup or #565-030 deep cup Dorman freeze (core) plug. Notice that 1962 is a split year where the casting date will determine dish or cup style freeze plug. -- Gary P."

Thanks,
Gary H.

>  -------Original Message-------
>  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

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