Upvote:1
According to the Connections Map - International / US Arrivals map for YVR:
Passengers connecting to international flights go through Canada Customs (CBSA) on Level 4 and then proceed directly to their next gate on Departures Level 3. Follow the signs for “International Connections” and then “D Gates”.
An hour should be sufficient, but don't delay.
Upvote:3
This is a legal connection, but barely. Minimum connection for US to international in YVR is 60 minutes. See https://www.aircanada.com/us/en/aco/home/plan/check-in-information/minimum-connection-times.html
You have to clear Canada immigration, but you should not need to go through security again. If all goes well, you should be able to make it, but if custom lines are long and/slow or if your inbound is delayed, you'll miss it. If you do miss, Air Canada will rebook you on the next flight which may be at a later date.
Tips:
Connecting in Canada is always a major hassle. The form asks for "duration of stay in Canada" and I'm always tempted to write "Only another 45 minutes, but only if you can do your job promptly". Probably not a good idea :-)