Googlebot would use the default port for the protocol. In this case that would be port 80 for HTTP. It wouldn't have any reason to access using another port unless that port was possibly part of a link it might try and follow. I'm not certain that googlebot as a user agent is even to allowed to access ports other than 80 and 443 (for https). In other words, Googlebot isn't doing a port scan, it's following links.
I'm pretty sure Googlebot can access ports other than the defaults for HTTP and HTTPS. Like nanocet said, it follows links. When ports other than the default are used, Google usually shows them on the SERPs.