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Terry Burtz, Calif · 04-29-2021, 07:51 PM

The large bolt has a 5/16 inch hole through the center to feed the main oil galley and the head is tapped 1/4 NPT.

The small bolt has a 1/16 inch through hole for an oil gauge and the head is tapped 1/8 NPT.

04-29-2021, 07:51 PM	#5
Terry Burtz, Calif Senior Member Join Date: May 2010 Location: Campbell,CA, USA Posts: 395	Re: BURTZ Engine info Q.... The large bolt has a 5/16 inch hole through the center to feed the main oil galley and the head is tapped 1/4 NPT. The small bolt has a 1/16 inch through hole for an oil gauge and the head is tapped 1/8 NPT.