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12-21-2017, 11:23 PM | #1 |
Senior Member
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,797
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1972 350 single exhaust
I put an original truck on the lift yesterday that still has the original exhaust. It's not clean, but original.
The thing that jumped out at me the most is the tailpipe. Notice the last 18" or so of the tailpipe is larger than the pipe from the muffler. I forgot to measure. Also the downpipe on the passenger side has a curve at the starter, and on the driver side, a flat spot on top of the pipe. I don't think many people will use this info, but here it is.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
12-21-2017, 11:26 PM | #2 |
Senior Member
Join Date: Sep 2008
Location: Harrison, Arkansas
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Re: 1972 350 single exhaust
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
12-22-2017, 12:37 AM | #3 |
20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,562
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Re: 1972 350 single exhaust
Anything to do with the history of these trucks is interesting. That said, I would be amazed if that's the original exhaust but I'll take your word for it.... not trying to argue. Reason I am amazed is back in the day, gas was leaded and I assumed it was also corrosive, which would explain my need to have exhaust repairs done every few years or so on my K20. The thought of an exhaust system surviving this long is astounding.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
12-22-2017, 08:37 AM | #4 |
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Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: 1972 350 single exhaust
All the hangers and clamps are factory. I just finished a resto on a 67 stepper with a 350 under the hood. Trying to find a 2-1/4" flared flange to fit the factory rams horn manifolds proved to be nearly impossible. I wound up using a pair of lazar cut 3/8 plate flanges with slotted holes to accommodate the 2-1/4" down pipes. PS. Lead is not corrosive and neither was the gasoline back in the day. Todays gasoline however is with the alcohol and moisture it absorbs, it's breaking down when you get it out of the pump!
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" |
12-22-2017, 10:55 AM | #5 |
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Join Date: May 2011
Location: Fort Pierce, FL
Posts: 430
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Re: 1972 350 single exhaust
Pipes are aluminized now days, and I don't think they were anything but raw steel back in the day. I agree, replacing pipes was something done regularly every few years. Now days, I have aluminized pipes that are 25 years old and still look new. I now live in Florida, so maybe a few years with salted roads may change that, I don't know.
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12-22-2017, 12:43 PM | #6 |
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Join Date: Aug 2013
Location: Homedale, Idaho
Posts: 160
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Re: 1972 350 single exhaust
Mine still has the original crossover single exhaust system. The pickup came factory with a 350/SM465 combo. I had an old muffler guy ( old as in he's older than I am, which is old ) look at the driver exhaust pipe that was "hammered flat" on top. He told me that was standard factory exhaust for a standard transmission so the clutch linkage rod would not hit the pipe. It now made sense to me remembering as a kid I had seen several like that over the years. Auto trans was an added option back then. Everything came with a standard trans unless you paid extra.
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Grandpa 1953 M38A1 Jeep 1989 GMC K2500 1958 Alaskan Camper all original WORK : A necessary evil that finances what I really like to do. |
12-22-2017, 12:54 PM | #7 | |
Senior Member
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,797
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Re: 1972 350 single exhaust
Quote:
The muffler was the first to go on these original systems, because of condensation. The muffler on this truck has been changed. This truck came from Arizona and wasn't driven much after it go there. The Y pipe is obviously original, because of the indentations. I can't believe anyone would try to reproduce the tailpipe on a work truck. The hangers don't prove the intermediate pipe is original, but it's very common for muffler shops to cut the lower part of the original hanger and replace it with a clamp.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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