We have to winterize the VT club boat tomorrow-normally we pull the drain plugs on the manifolds and the two bolts on the block and are good to go, but the manifold drain plug holes are so rusted out that we are scared to take them out again in fear that they won't go back in (I already rethreaded one hole and taped the threads on both. They hold water for now...)
So I hear the alternative is to get a 5 gal bucket of antifreeze and winterize it that way. What's the actual process for this? Put the boat on the trailer, find the raw water intake (where is this/what does it look like) and put it in the bucket, start the boat until antifreeze starts spitting out of the exhaust? Is it 100% freeze proof like pulling the plugs/bolts? What tools are required? Any other tips/concerns? Any specific type of antifreeze I need to use to not gum up the engine?
The boat is a 1990 Supra Sunsport with the classic PCM 350 engine if that helps. The big thing is I have no idea where the raw water intake it or how I rig it to suck up antifreeze.