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

Can you ID these headers?

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Old Oct 16, 2009 | 08:35 PM
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Default Can you ID these headers?

They are supposedly 1 3/4" headers by TPIS???
Circumference of the primaries is roughly 6".

Anybody seen these before? I have my thoughts but I will keep them to myself...
TIA



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Old Oct 16, 2009 | 09:49 PM
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If they are SLP's they will have SLP logo on the somewhere. My headers on my 99 camaro have a welded plate on them that says "SLP"

Are they any numbers or words on them anywhere?
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Old Oct 16, 2009 | 11:00 PM
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They look like my old TPIS long tubes....

No identifying marks on mine anywhere, but they were purchase by me from TPIS.
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Old Oct 16, 2009 | 11:28 PM
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No marks anywhere.

Really Aaron? Huh, very VERY interesting. I thought they might be LPE 1 3/4 longtubes as they are the exact same pipe layout as my LPEs.

Do you have any pictures of yours to compare these with?

I love my LPEs but with my angle plug (non-l98 angle, not straight) Dart heads (Dart has the only heads apparently that have this problem) it is an absolute bear to change plugs, so I picked these up as TPIS says their's don't have interference. (Did TPIS change styles perhaps?)

Thanks for the info, this gives me hope that they will work out after all!

Last edited by USAsOnlyWay; Oct 17, 2009 at 05:06 AM.
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Old Oct 17, 2009 | 03:41 AM
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The weird thing is, I thought TPiS headers used standoffs and the stock exhaust bolts. These are flush just like my 1 5/8" LPEs. They really look identical besides the diameters of the piping.

Does anyone have pictures of 1 3/4" LPE longtubes?
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Old Oct 17, 2009 | 04:55 AM
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I can tell you 100% that they are not the current TPIS design, no idea on the posibility of older versions.

Mine.

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Old Oct 17, 2009 | 08:14 AM
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Originally Posted by Firevette
I can tell you 100% that they are not the current TPIS design, no idea on the posibility of older versions.

Mine.
My TPIS are 5 years old and look like Firevettes.
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Old Oct 17, 2009 | 09:38 AM
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They certainly don't look like my TPiS headers. The pipe routing is different, the emissions air tubes are different. Mine don't have air tubes to #7 or #8 pipes. The EGR looks different too.
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Old Oct 17, 2009 | 10:52 AM
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Originally Posted by Firevette
I can tell you 100% that they are not the current TPIS design, no idea on the posibility of older versions.

Mine.

Yep my TPIS 3 years old but look the same as these !
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Old Oct 17, 2009 | 01:23 PM
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I called TPiS (they were there today!) he couldn't say over the phone but they did change their header design many years ago. I sent him an e-mail with some pictures and he said he'd look on Monday and get back to me on it.

I'm still not sure if they are TPiS or LPEs. Either way, good headers.

Last edited by USAsOnlyWay; Oct 17, 2009 at 02:50 PM.
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Old Oct 17, 2009 | 04:50 PM
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Changing spark plugs could be interesting. For my TPiS headers, I had to modify a spark plug socket to get the plugs behind the pipes. I shortened the socket and cut a slot down the side so the socket went on from the side of the plug. Then tighten with an open end wrench.
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Old Oct 17, 2009 | 11:12 PM
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http://forums.corvetteforum.com/c4-t...these-are.html
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Old Oct 17, 2009 | 11:46 PM
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Originally Posted by cumbercr
Changing spark plugs could be interesting. For my TPiS headers, I had to modify a spark plug socket to get the plugs behind the pipes. I shortened the socket and cut a slot down the side so the socket went on from the side of the plug. Then tighten with an open end wrench.
Yeah, I have identical bends in my LPE 1 5/8" headers right now. I also mocked them up on 113s as well. The 113s were fine, my Dart-Specific Angle heads work too, but are a bit of a pain. If I had L98-angle (such as stock) or straight plug heads I would be fine.

Originally Posted by GREGGPENN
http://forums.corvetteforum.com/c4-tech-performance/2098924-anyone-know-which-headers-these-are.html
Thanks Gregg, LPEs were my assumption too. The odd thing is that those headers have the exact same flange as my LPEs, these do not have that same flange. Thus why I think they might be something else. Unfortunately, I had a friend pick these up locally and while I told him how to identify TPiS headers, he only measured the primaries (1 3/4") and collector (3") My LPE 1 5/8" fit fine (no frame clearancing like some headers need, etc), no scraping, room for the old and new starters, have a thick flange and have been real quality pieces so if they are LPEs equal length headers I'll be happy with that too.

I sent an e-mail to TPiS so we'll see what they say.

Either way a set of headers will be up for sale soon probably. Either LPE 1 5/8" or LPE/TPiS 1 3/4"

We'll see!

Last edited by USAsOnlyWay; Oct 18, 2009 at 12:45 AM.
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Old Oct 18, 2009 | 12:41 AM
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Don't look like TPIS new design and definitely dont look like LT1/4 headers.

Maybe you guys having plug issues with TPIS have the older design? I should make a video of how fast I can do them on my 93. If I tried I can probably speed all the plugs out and in in less than 10 minutes with no fancy tools.
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Old Oct 20, 2009 | 11:39 PM
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Originally Posted by USAsOnlyWay
I had a friend pick these up locally and while I told him how to identify TPiS headers, he only measured the primaries (1 3/4") and collector (3").

Either way a set of headers will be up for sale soon probably. Either LPE 1 5/8" or LPE/TPiS 1 3/4"

We'll see!
Ugh...If they were measured at 1 3/4", how could they be 1 5/8"? Sounds like you have you're answer.
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Old Oct 21, 2009 | 02:42 PM
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No no no.

I have LPE 1 5/8" headers already. So, either those or these LPE/TPiS 1 3/4" headers will be up for sale. Get it? (two sets of different headers)

The headers in the pictures are definitely a 1 3/4".

As to whether they are TPiS or LPE, I believe they are an older TPiS design. They are the same design as LPE and Stainless Works headers, merely, they all use a different style of flange.

Last edited by USAsOnlyWay; Oct 21, 2009 at 02:46 PM.
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Old Oct 21, 2009 | 05:06 PM
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Originally Posted by 8000RPM
Don't look like TPIS new design and definitely dont look like LT1/4 headers.

Maybe you guys having plug issues with TPIS have the older design? I should make a video of how fast I can do them on my 93. If I tried I can probably speed all the plugs out and in in less than 10 minutes with no fancy tools.
If someone is using these headers on an LT1 they will have many problems. They are designed specifically for the L98, one 02 sensor, L98 EGR ports etc...

I'm glad your new LT1 TPiS headers work on your LT1 but that has no relevancy here. Thanks though.

Last edited by USAsOnlyWay; Oct 21, 2009 at 05:27 PM.
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