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JSeery · 02-12-2018, 08:34 PM

Zinc is not going to help anything. A heavier viscosity oil is beneficial if the bearing clearance is a little excessive, but don't think it will help much with rings or valve guides. Try a stop leak on the coolant. That is fairly high mileage on a flathead if it has not been well maintained, do you know the maintenance history?

02-12-2018, 08:34 PM	#2
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: 1950 8BA Oil Gusher Zinc is not going to help anything. A heavier viscosity oil is beneficial if the bearing clearance is a little excessive, but don't think it will help much with rings or valve guides. Try a stop leak on the coolant. That is fairly high mileage on a flathead if it has not been well maintained, do you know the maintenance history?