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Old 10-29-2017, 06:05 PM   #8
71cheyennesuperlongb
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Join Date: Aug 2015
Location: Alcoa;Tn
Posts: 208
Re: Exhaust diameter for a 71 stock GMC

Pipe is measured I.D. Tubing such as exhaust ismeasured by theO.D. Retired pipefitter of 40 years.
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'70 CST/10 SWB - Soon to be Daughter's truck when finished
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