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Cris · 03-23-2021, 12:59 PM

Thanks guys.

Wrenchbender, I think your memory is correct. My best guess right now is it is a 3/4"-18 flare thread. I have not 100% confirmed this, but dimensions match up perfectly. This makes more sense in that the EGR pipes themselves were flared.

It definitely is NOT the metric fitting.

03-23-2021, 12:59 PM	#4
Cris Registered User Join Date: Aug 2016 Location: Los Altos Hills, California Posts: 170	Re: Thread Size of EGR on a 292 Head Thanks guys. Wrenchbender, I think your memory is correct. My best guess right now is it is a 3/4"-18 flare thread. I have not 100% confirmed this, but dimensions match up perfectly. This makes more sense in that the EGR pipes themselves were flared. It definitely is NOT the metric fitting.