I've never had any issues with USPS shipping to Canada. I actually prefer USPS over FedEx or UPS, as both the carriers ding us with stupidly large brokerage charges crossing the border.
Right... If you bothered to read the previous posts between @iwanaflattie and myself, you'd see that he is shipping two rims, not an engine. I'm fully aware, as are most people, that no regular postal service will ship an engine.
Ok that's good to know. So I missed that as the thread was originally about shipping an engine. Shoot me Geez I Missed the shift in the topic. I agree with the USPS shipping to Canada, I prefer that myself. Way cheaper than the rip-off UPS.