LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Mac mid length "offroad" headers feeler

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Old Jun 20, 2017 | 12:08 PM
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Default Mac mid length "offroad" headers feeler

We are looking at getting a short run of the mid length headers for 93 and 94/95 lt1 fbodys done from Mac. Ceramic coated or std polished avail. They will be the same price BUT they wont have the air and egr fittings to cap off, block etc.
If you are interested comment, pm, or email me
Eta is 3 to 4 weeks. Let us know asap so we can get your order taken and on the list!! DO NOT WAIT. IF YOU WAIT TIL THE END IF 3 WEEKS YOU WILL NOT BE IN ON THE ORDERS.
93 chrome is $469 shipped
93 coated is $639 shipped
94-95 chrome is $528 shipped
94-95 coated is $649 shipped

Rpmspeedtech@gmail.com

Last edited by tech@WS6store; Jun 20, 2017 at 12:13 PM.
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Old Jun 20, 2017 | 12:29 PM
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Is that the header that has the slip-fit joint on the driver's side cylinder closest to the front of the car?? How do you prevent them from leaking through the joint?

Last edited by ShovelMan; Jun 20, 2017 at 12:49 PM. Reason: Clarified
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Old Jun 20, 2017 | 12:32 PM
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They use ball flanges not slip fit. A quick google search shows what they use.
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Old Jun 20, 2017 | 12:36 PM
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These?
Attached Thumbnails Mac mid length "offroad" headers feeler-dd.jpg  
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Old Jun 20, 2017 | 12:40 PM
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Yes those are them
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Old Jun 20, 2017 | 03:06 PM
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My question was answered confirmed by the picture. Thank you. Answer is yes.
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Old Jun 20, 2017 | 03:11 PM
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They arent slip fit they are ball flange. many header co's use ball flange including kooks.
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Old Jun 20, 2017 | 03:23 PM
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I am not talking about the connection between the headers and the Y Pipe.
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Old Jun 20, 2017 | 03:47 PM
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It used the ball flange for the cat hookup as well unless you get the cat delete pipe...which is still ball flange as well.
The collectors are not slip fit on the primaries either, they are welded on. Nothing on that system is slip fit though.
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Old Jun 20, 2017 | 04:32 PM
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Shovelman is talking about the "slip fit" on the #1 cylinder primary where it connects to the rest of the piping. I have these headers, great fitment, great spark plug access, and the ball flange connections seal great, however the # 1 primary fiting is a pain to get to seal. Still best overall header around all things considered.
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Old Jun 20, 2017 | 04:44 PM
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On the same page now! i was completely passing over thst part. My apologies to shovelman. other than welding it, it could be an issue but ive installes a few and never has issues. We normally upgrade to the stage 8 locking bolts or percys and the metal gaskets, but thats all.
These are the best fitting with good ground clearance mids for the price and the option right now of no egr and air fittings to work around is even better, esp vs othe mids that cost $200+ more.
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Old Jun 20, 2017 | 05:09 PM
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Originally Posted by 350 groundpounder
Shovelman is talking about the "slip fit" on the #1 cylinder primary where it connects to the rest of the piping. I have these headers, great fitment, great spark plug access, and the ball flange connections seal great, however the # 1 primary fiting is a pain to get to seal. Still best overall header around all things considered.


What have you tried to seal the joint? I purchased a tube of walker exhaust putty and two clamps and it still leaks. It's so embarrassing I may have to dump them for Long Tubes.
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Old Jun 20, 2017 | 05:16 PM
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Shovelman can you email pictures to me of your issue?
rpmspeedtech@gmail.com
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Old Jun 20, 2017 | 06:06 PM
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Shovelman, for me it leaked a little bit the first few hundred miles. I caked it with high temp rtv and got that bolt super tight. So far with 3500miles on the headers it hasnt leaked again. It was nice not having to remove the steering knuckle to install them though.
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Old Jun 20, 2017 | 08:27 PM
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Bolt? What clamp are you using?
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Old Jun 20, 2017 | 10:04 PM
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Mine came with a clamp/bolt and nut. I believe it was from mac. See pic.
Attached Thumbnails Mac mid length "offroad" headers feeler-20170118_130546.jpg  
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Old Jun 23, 2017 | 06:27 AM
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Originally Posted by 350 groundpounder
Mine came with a clamp/bolt and nut. I believe it was from mac. See pic.
I believe that's called a "band clamp"....
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Old Jun 23, 2017 | 08:53 AM
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I can't find a band clamp as small as 1-1/2" and 1-7/8". RIP.
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Old Jun 23, 2017 | 10:22 AM
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Originally Posted by ShovelMan
I can't find a band clamp as small as 1-1/2" and 1-7/8". RIP.
Motorcycles use that size. There are many to choose from. http://www.jpcycles.com/product/zz47317
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Old Jun 26, 2017 | 12:20 PM
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If you want to get in on this, please let us know this week!!
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