C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Question about headers

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Old Nov 10, 2025 | 12:02 PM
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Default Question about headers

Looking to get some long tube headers for my 84 auto. Will these fit? Seller says they are flowmaster longtubes for a 350. Im fine with matching the collector to the rest of the exhaust im just curious about actual fitment to the bolt pattern/clearance



Last edited by CrossfireInfection; Nov 10, 2025 at 01:17 PM. Reason: wanted to change/add details
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Old Nov 11, 2025 | 10:34 PM
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You're going to need a C4 Corvette Specific Headers.
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Old Nov 11, 2025 | 11:41 PM
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Hedman has reasonably priced C4 fitment headers from Summit Racing, but they will need the proper collector extensions fabricated.
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Old Nov 12, 2025 | 07:47 AM
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Originally Posted by Gale Banks 80'
You're going to need a C4 Corvette Specific Headers.
how come? Just curious, i dont need the plumbing on top and I can add my own o2 bung, just wondering what else
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Old Nov 12, 2025 | 07:48 AM
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Originally Posted by AZSP33D
Hedman has reasonably priced C4 fitment headers from Summit Racing, but they will need the proper collector extensions fabricated.
what is special about the fitment?
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Old Nov 12, 2025 | 01:42 PM
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The reason you need C4 specific headers is there is very limited clearance around the engine because of where it sits in the chassis as well as things like the cross braces under the engine. Just look up a pair of C4 headers and compare them to the ones you pictured. Night and day. You wouldn't even be able to get those headers in to the engine bay, much less bolted up.
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Old Nov 12, 2025 | 03:29 PM
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Originally Posted by djpink889
The reason you need C4 specific headers is there is very limited clearance around the engine because of where it sits in the chassis as well as things like the cross braces under the engine. Just look up a pair of C4 headers and compare them to the ones you pictured. Night and day. You wouldn't even be able to get those headers in to the engine bay, much less bolted up.
I see, thank you! Any recommendations?
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