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G.M. · 09-19-2012, 08:36 AM

I believe they are 3/8" course threads with lock washers. The Ford parts manual has the correct lengths. If I recall they are 7/8" which is an odd size. 1" is a standard size BUT longer bolts could bottom out and not pull the pump up tight against the gasket. Use grease on both sides of the gaskets not silicon or gasket sealant. G.M.

09-19-2012, 08:36 AM	#2
G.M. Senior Member Join Date: May 2010 Location: Florida and Penna. Posts: 4,471	Re: 59A Flathead Water Pump Bolt Size? I believe they are 3/8" course threads with lock washers. The Ford parts manual has the correct lengths. If I recall they are 7/8" which is an odd size. 1" is a standard size BUT longer bolts could bottom out and not pull the pump up tight against the gasket. Use grease on both sides of the gaskets not silicon or gasket sealant. G.M. __________________ www.fordcollector.com