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flathead4rd · 02-17-2020, 02:58 PM

Mine runs about 40 to 50 PSI on startup. I use Castrol 10w-50. After warm up and when it's really hot outside my pressure will drop down to about 10 PSI. With water temperature around 195. Flatheads depend on oil flow not so much on oil pressure. I am running a 286 C.I. flathead.

02-17-2020, 02:58 PM	#2
flathead4rd Senior Member Join Date: May 2010 Location: Michigan Posts: 505	Re: flathead oil pressure? Mine runs about 40 to 50 PSI on startup. I use Castrol 10w-50. After warm up and when it's really hot outside my pressure will drop down to about 10 PSI. With water temperature around 195. Flatheads depend on oil flow not so much on oil pressure. I am running a 286 C.I. flathead.