525 EFI - XRs

Have flush ports so I dont need to use muffs. Can I start them on the hose with the drives off the boat?

yep,,done it many times,

Yes, just cover up the gimbal housing so you don't get water from the exhaust getting into the exposed areas.

my flush port on a 502 mag runs in to a t that feeds the sea pump, can I fill with antifreeze through this port?

Thanks guys!

You should be able to. The suction from the sea pump should pull the antifreeze through. You should make sure your container of antifreeze is higher than the flush port to allow gravity to assist the feed to the sea pump..

Yes you can. I would suggest taping up the intake ports on your drive with some duct tape. That way, the seapump will not suck any air.