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57rookie · 10-28-2017, 09:47 PM

I am looking to see what the stock diameter ( the diameter that the muffler manufactures want, not sure if ID or OD) for a bone stock 1971 GMC with a 350 and a 4BBL carb. I dont have the measuring tool to clamp on and find the diameter.... My best guess is 2.5#. Looking to see what you experts know.
Thanks!!!!!!

10-28-2017, 09:47 PM	#1
57rookie Registered User Join Date: Jul 2011 Location: Calgary, Alberta Posts: 153	Exhaust diameter for a 71 stock GMC I am looking to see what the stock diameter ( the diameter that the muffler manufactures want, not sure if ID or OD) for a bone stock 1971 GMC with a 350 and a 4BBL carb. I dont have the measuring tool to clamp on and find the diameter.... My best guess is 2.5#. Looking to see what you experts know. Thanks!!!!!!