Help ID motor. Potentially/likely canadian

pishta said

Didn't the valve cover change slightly for the peanut plug head? I don't know but I thought I heard that somewhere...maybe it was the bearings.....

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Looking through older posts I found someone saying they should work up to 80. Then they get different after that.
I will likely swap mine over this weekend. Along with drool tube gaskets and some engine cleaning and hopefully it'll stop leaking. It's not enough to drip, but enough to be unsightly.