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Exhaust header ?

Old 08-31-2011, 09:10 AM
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Smile Exhaust header ?

Question : on the Ls3 engine the exhaust
Header from GM etc is 1.7/8 inch diam.
Due to restricted space it seams that
You can only use 1.5 inch diam. Tube on the

Does that do any harm to the engine...
Head...or noticeable performance !
Does the restriction cause a overheating of
The head ?

Thanks in advance
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Old 08-31-2011, 01:09 PM
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Theoretically, yes, it will cause it to run hotter. Reality- I've not seen any added KR. Now the dented headers will cause the one cylinder to run hot. The old headers guys had to run were dented on cylinder number 1 and sometimes on 7.... And they were BASHED in!
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Old 09-19-2011, 02:16 PM
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My kit from Boss Frog had the Hooker shorty headers so they cleared the steeering column with a little dent on the collector but none on the tubes. I would love to see some long tube headers put on a LS motor as I'm sure I have alot of back pressure from the restricted exhaust setup. Not much room to work with there.
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