Quote:
Originally Posted by billybronco1
Jseery, what products have you used with success? Was it a permanent fix?
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Don't remember at the moment, but one I used in a HP 427 big block required you to remove the antifreeze and flush it out a little with straight water. Then fill it up with water (no antifreeze) and the sealant and run it for some specified period of time. Then drain it and refill it with an antifreeze mixture. The engine had a leaking head gasket and it fixed the problem, to my surprise. Not something I would normally suggest on a HP engine, but it worked in a pinch. On a stock flathead I don't see any issue with trying a sealant. It is my understanding the the sealants only work on very small openings and are not an issue on radiator or heater cores or thermostats, etc.
Water Glass is an old flathead standby.
"Liquid glass" (sodium silicate) is added to the system through the radiator, and allowed to circulate. Sodium silicate is suspended in the coolant until it reaches the cylinder head. At 100–105°C (212-221°F), sodium silicate loses water molecules to form a glass seal with a remelt temperature above 810°C (1,490°F)