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Ol' Ron · 07-14-2015, 07:30 AM

A 7/16 tap fits through the horazontal plug on the oil pump boss on the back of the block. It goes into the oil passage to the center of the block. This is where the grub screw goes. Run the tap in an inch or so, install a 1/2" 7/16 -14 set screw. simple, easy.

07-14-2015, 07:30 AM	#45
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,857	Re: The Flathead oil modification thread... A 7/16 tap fits through the horazontal plug on the oil pump boss on the back of the block. It goes into the oil passage to the center of the block. This is where the grub screw goes. Run the tap in an inch or so, install a 1/2" 7/16 -14 set screw. simple, easy.