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  #1 (permalink)  
Old 01-21-2021, 04:05 PM
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Default Headers problems

Hi guys, bought a classic roadster a few years back. Itís been nothing but problems. Just bought a new 351W 427 stroker from blue monkey performance and cannot find headers that fit. The ones from GP were made for factory five. Is there anyone out there that can send me in the right direction?
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  #2 (permalink)  
Old 01-21-2021, 05:22 PM
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I built my own, the headers that came with the kit were wrong flange and too small tube size. There are companies that can build you a set using a plastic header block kit. Plus I used stainless steel vs cold roll steel.
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Old 01-21-2021, 05:26 PM
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John (74ProII) should be able to help you, if he didn't chime in, I have his Phone#. I can call him for you. Cheers TommyRot.
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Old 01-21-2021, 05:40 PM
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Thanks guys. Iím located in Chicago land. Iíve gone through a few custom shops, one wanted $4500 min. Iíve called gp headers and they sent me factory 5 headers that didnít fit. I saw a fb post of a guy that sent in his jig to gp headers and I asked him where heís sending it he said gp headers but the guy in the phone there said they donít do that anymore. This guy sent it out 3 days ago. Iím lost here. Thanks
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Old 01-21-2021, 08:28 PM
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Cobra Make, Engine: CSX 6079 482CI CSX cross ram
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been there, when I got my CSX the headers were not even close to fitting right. Bob at ERA recommend a company called https://www.tubularautomotive.com/
I sent him my headers and he fixed them perfectly... The guy is a class act and very nice to work with.. I highly recommend you contact him...
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  #6 (permalink)  
Old 01-22-2021, 01:16 PM
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So it looks like you've found out that there is very little in common from one kit car to the next. While they look similar, they actually exit differently. There are several kits out there to make your own, flanges for the engine side are a dime a dozen. The side pipe side not so much. Stainless headers has some , i can't get there from work computer. If I remember they have some merge collectors. But they do have the you design, they build, good quality and much cheaper than a lousy "shop built" set. Racemufflers.com had flanges and gaskets. The more I investigated for mine, the more these two options were the best. There is a third overlooked option. As you've been to FFR, did you check out their header options? Specifically the "j pipe" configuration. Using that method you could you almost any shorty header of your choice, then using that method and a merge collector/flange to your pipes. In that configuration you would just need to "fab" the "j pipe". some of the FFR guys have broke theirs within 1000 miles due to the weight of the pipes. Basically creating pressure from being a giant fulcrum point. I doubt that would occur on a CR because of how the pipes are mounted. Most of them i've seen, they do not hard mount them, rather just a rear rubber mount (think modern muffler mount) allowing for too much movement. It is a trade off, stiffer poly engine mounts will transmit more vibration to the chassis, where stock allow more motor movement which will add stress on the system. I have been really leaning towards the "j pipe" configuration for my coyote, as even the stock manifolds i have flow quite a lot, and most headers for a coyote run close to $800 or more.

Last edited by 74proii; 01-22-2021 at 01:47 PM..
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Old 01-22-2021, 01:22 PM
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https://www.gpheaders.com/products/cobra-kit-headers/
look also a their "custom header" section to see mock up kit

#13861 - 1987-1995 J-Pipe Kit - Factory Five Parts Catalog


http://www.primequip.net/products/Pr.../sidepipes.htm

Yes, the second one you reverse sides on the header, same thing I had to do on my Pro street 74 351C car. They also had some info on better mufflers that it looks like FFR no uses?

Last edited by 74proii; 01-22-2021 at 01:51 PM..
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Old 01-23-2021, 08:51 AM
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Cobra Make, Engine: Classic Roadster, 408 LSX
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I had a race car builder make me a set. 1 7/8 stainless.
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I've spent most of my money on cars and women. The rest I wasted.
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Old 01-25-2021, 07:36 PM
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contact Dana at shell valley. he might be able to help you
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