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Anyone with a 1973 Cutlass with dual exhaust?

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Old May 28, 2025 | 09:26 PM
  #1  
CutlassMarc's Avatar
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Anyone with a 1973 Cutlass with dual exhaust?

That is willing to take a photo of the transmission crossmember.
I am planing on adding duals to my car, but need to see where to "mod" the later 75-77 crossmember for pipe clearance.
Thanks.
Old May 29, 2025 | 01:17 PM
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A friend had a 77 442, we swapped in a 455/th400 combo. He just bolted in an earlier crossmember.

The modifications to the existing crossmember would be determined by where exactly the exhaust is routed.
Old May 29, 2025 | 04:03 PM
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Back in the days of no internet, tv, radio, pony express, namely 1991, the last time I did one of these cars, all we did was hang the header (or exhaust manifold) and figure it out. You're going to need more clearance Clarence than just for the pipe. It will need to be a bit bigger. You know, so it will fit.
Old May 29, 2025 | 06:07 PM
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G-Force. Made in the USA! Check Summit/Jegs they may have it cheaper.
https://www.crossmembers.com/product...ember-hardtops



Old May 29, 2025 | 06:52 PM
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They are completely different crossmembers. The 73/74 are straight across where the 75-77 have that hard angle to clear the catalytic converter.
Old May 29, 2025 | 07:23 PM
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https://autos.yahoo.com/turn-heads-r...174829866.html
Old May 30, 2025 | 09:06 AM
  #7  
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I see what you did there........
Old May 30, 2025 | 09:27 AM
  #8  
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Originally Posted by svnt442
They are completely different crossmembers. The 73/74 are straight across where the 75-77 have that hard angle to clear the catalytic converter.
Do any of these cars still have a converter? 😁

Without the converter, the 73-74 dual hump crossmember will bolt right in with no mods.
Old May 30, 2025 | 01:57 PM
  #9  
z11375ss's Avatar
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Yeah, lose the converter. Good idea.
Old May 30, 2025 | 05:27 PM
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Originally Posted by z11375ss
I see what you did there........
... No offense. And of course you are correct no more accurate way to modify the bar than your way. Last time I had an Olds converted to true duals. A pro shop notched and boxed it on the test fit.

I just posted what the OP wanted, and of course took the opportunity to post a beautiful 1973 H/O W30 at the same time.
https://www.motorious.com/articles/h...ile-hurst-w30/
Old May 30, 2025 | 06:36 PM
  #11  
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It's really all the op needed.
Old Jun 4, 2025 | 10:54 PM
  #12  
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Originally Posted by 69CSHC
... No offense. And of course you are correct no more accurate way to modify the bar than your way. Last time I had an Olds converted to true duals. A pro shop notched and boxed it on the test fit.

I just posted what the OP wanted, and of course took the opportunity to post a beautiful 1973 H/O W30 at the same time.
https://www.motorious.com/articles/h...ile-hurst-w30/
Thank you.
I asked, because a 400.00 new crossmember is out of the question, and I'd like to do the rework of the crossmember before I try to install the exhaust. I am working on jack stands and in driveway. It can't sit on the stands for days while I try to install the pipe off the manifold and then take the crossmember out and have it welded/cut.
I want to pull the crossmember, have it reworked. then install it back in place. So I can do the stock 1973-4 exhaust on a week end.
I did the google search, but either I don't put enough keywords. as I got. images that some were of a 1967 another was a 1986 , So I didn't trust that what I was looking at was what I was after.
Thanks again.
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