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Planojc · 06-22-2011, 03:35 PM

Most of the time a compression leak will make bubbles in the coolant with engine running. I run a 4lb cap on my 51 and use a Skip Haney 3lb pressure valve on the overflow tube.

06-22-2011, 03:35 PM	#7
Planojc Senior Member Join Date: May 2010 Location: Plano, Texas Posts: 1,122	Re: Flathead cooling advice wanted Most of the time a compression leak will make bubbles in the coolant with engine running. I run a 4lb cap on my 51 and use a Skip Haney 3lb pressure valve on the overflow tube.