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Re: 1965 Exhaust Recommendation
Mark, mine is about 1.5", no where near the 1.89
My 64AIM calls for a spacing of .78 clearance to cross member tube (top)
Just checked my extra parts draw and found a mount which measures close to 2", (1.89"), so these are not all created equalLast edited by Alan D.; April 15, 2019, 01:34 PM.Comment
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Re: 1965 Exhaust Recommendation
Alan,
What measurement are you making when you get 1.5" or 1.89"? I have an NOS GM transmission exhaust bracket that I plan to use on my '66 and I'd like to check to see if I'm going to have a problem.
GaryComment
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Re: 1965 Exhaust Recommendation
Gary - this is just the thickness of the transmission mount. The extra 3/8" is causing the issue with the bracket raising the exhaust pipe too high so it is touching the top of the pipe. I went to a couple auto parts stores and looked at 3 mounts and they are all 1 7/8" thick. Here is a photo of mine next to the new one. The new one is 1.890 and my old one is 1.530. I think I will buy a transmission bracket meant for the base car with 2" pipes, adjust the radius slightly for the 2 1/2" pipe then install it. That will lift the pipe 1/4" and get me 3/8" clearance. I can bend the tab down a bit to get a bit more. Thanks, Mark
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Re: 1965 Exhaust Recommendation
Gary, think I maybe looking at wrong part, so I'm referring to the part marked G4.081 (not a C2 drawing)Comment
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Re: 1965 Exhaust Recommendation
Alan, Mark,
I know what part that is. Hopefully the GM NOS transmission mount I have is the correct thickness.
GaryComment
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Re: 1965 Exhaust Recommendation
Mark,Gary - this is just the thickness of the transmission mount. The extra 3/8" is causing the issue with the bracket raising the exhaust pipe too high so it is touching the top of the pipe. I went to a couple auto parts stores and looked at 3 mounts and they are all 1 7/8" thick. Here is a photo of mine next to the new one. The new one is 1.890 and my old one is 1.530. I think I will buy a transmission bracket meant for the base car with 2" pipes, adjust the radius slightly for the 2 1/2" pipe then install it. That will lift the pipe 1/4" and get me 3/8" clearance. I can bend the tab down a bit to get a bit more. Thanks, Mark
Could you freeze the mount and then mill down the plateau on the rubber portion?
GaryComment
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Re: 1965 Exhaust Recommendation
Gary - possibly. Would worry about losing too many threads though. Since no one seems to be having any problems like this then I will probably use the taller mount and just use the 2" version of the transmission bracket. I called Corvette Central and they said about a year and a half ago they lengthened the long pipe because others requested that. I am going to try bending the area that kicks up right before the muffler and see if that helps. MarkComment
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Re: 1965 Exhaust Recommendation
Gary------
The original mount has become compressed in service. An NOS GM mount measures 1.87" in height. The one that I measured is a GM #3913498 which is the 1967 successor to the GM #3792133 used for 1963-67 and is the same height as that mount.
Attached photos:
In Appreciation of John HinckleyComment
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Re: 1965 Exhaust Recommendation
Joe,Gary------
The original mount has become compressed in service. An NOS GM mount measures 1.87" in height. The one that I measured is a GM #3913498 which is the 1967 successor to the GM #3792133 used for 1963-67 and is the same height as that mount.
Attached photos:
Good to know. Some aspects of that part don't fall into the pretty, precision crafted category.
GaryComment
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Re: 1965 Exhaust Recommendation
Gary------
This is how the GM mounts always appeared. Nevertheless, appearances aside, they are superior to anything available in the aftermarket. Among other things, note how much thicker the metal frame of the mount is compared to aftermarket.In Appreciation of John HinckleyComment
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Re: 1965 Exhaust Recommendation
Joe - thanks for confirming the height of transmission mount. I will go with the reproduction and deal with the transmission exhaust hangar height by adjusting the bracket. The mount that CC sells is in a Federated Auto Parts box with the Anchor logo and is made in Korea. Mark
MarkComment
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Re: 1965 Exhaust Recommendation
I have only used original GM N11 systems in my cars. Never a problem with installation, fit, configuration, or judging.
The surface rust adds a patina which most of us judges appreciate and do not deduct points for. By the way there is
a side benefit no reproduction system can offer: The SOUND of the original system has never been duplicated accurately. I keep a couple
sets of N11 sets for replacement if needed just in case. I still have 3 mid year cars with under body exhaust systems.Comment
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Re: 1965 Exhaust Recommendation
Jaime - did you find NOS or NORS sets ? Aren't they very hard to find and expensive if you do find them ?
MarkComment
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Re: 1965 Exhaust Recommendation
Mark,
they are GM issued NOS. They differ slightly from what was used at the assembly plant (numbers on mufflers) but that's it.
They cost me between $1200-$1500 per set. I don't know what reproduction sets sell for.Comment
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