Thanks Rick - good to hear some AF will get in even if thermostat isn't open. My mechanic is the one who recommended the technique I've used. He told me to pour the AF in until I smelled it out of the exhaust after warming up the engine.
I'm 100% positive the engine is a Y2QM20H although not positive it's original, I just assume that. The boat is a 78 C&C34-1. I should check the C&C manual which is on the boat to see if it mentions the engine. On Dec 14, 2016, at 7:34 AM, Rick Brass <rickbr...@earthlink.net> wrote: There is a bypass port in the thermostat housing that allows a limited amount of water flow through the engine block and cylinder head prior to the thermostat opening. This is to prevent getting localized hot spots while the engine is warming up. So some of your antifreeze gets into the block so long as the engine is running. Are you sure it is a 2Qm20? I have a friend with a 1983 C&C 29-1. It has the original engine in it, which is a 2Gm13F. I had the impression that the QM was a replacement for the GM.
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