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**kwmech** · 07-20-2021, 06:13 PM

I'm pretty sure that a 3/8'' coarse thread 1-3/4'' or 2-1/4'' long--sometimes a 1/4'' longer will work without bottoming in the hole. Check for this. Any brackets attached to this part of the manifold will require longer bolts

07-20-2021, 06:13 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,730	Re: 72 C-20 Help I'm pretty sure that a 3/8'' coarse thread 1-3/4'' or 2-1/4'' long--sometimes a 1/4'' longer will work without bottoming in the hole. Check for this. Any brackets attached to this part of the manifold will require longer bolts