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L-head · 08-05-2025, 05:41 AM

The bolt inside the water pump outlet is a 3/8 NC with a 9/16" head. Use a six point socket on it and make sure you're firmly on the head of the bolt. They can be tough to get out.

08-05-2025, 05:41 AM	#9
L-head Senior Member Join Date: May 2010 Posts: 183	Re: 47 Flathead Water Pump Swap Tricks? The bolt inside the water pump outlet is a 3/8 NC with a 9/16" head. Use a six point socket on it and make sure you're firmly on the head of the bolt. They can be tough to get out.