Exhaust/headers pipe size? - Team Camaro Tech
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post #1 of 2 (permalink) Old Jun 4th, 14, 06:28 PM Thread Starter
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Location: CA
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Exhaust/headers pipe size?

Short version: What headers are better? 1 7/8 " or 1 3/4" primary tube? What diameter exhaust?

1969 Camaro daily driver.

Engine is a hotcammed LS3 376ci/480HP
Part Number: 19301358
Valve Lift (in): .525" intake / .525" exhaust
Camshaft Duration (@.050 in): 219į intake / 228į exhaust
Cylinder Heads (P/N 12615879): Aluminum L92 style port; as cast with 68cc chambers
Valve Size (in): 2.165 int / 1.59 exhaust
Compression Ratio: 10.7:1
Rocker Arm Ratio: 1.7:1

I'm going with Hooker LS Swap headers.
Part number 2276-3HKR has a primary tube diameter of 1 7/8".
Part number 2275-3HKR has a primary tube diameter of 1 3/8".

What differences could I expect to see between the two?
What is an appropriate exhaust diameter?
I currently have a 3" flowmaster that my old headers bolted to. These new headers are slip-on. Is there an adapter for that?
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post #2 of 2 (permalink) Old Jun 4th, 14, 06:55 PM
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Join Date: Jul 2009
Location: Gilroy,CA
Posts: 1,748
Re: Exhaust/headers pipe size?

with your cam I'd go with 1-3/4, you'll get a little more low end and should make plug changes easier. If the headers don't come with adapters you should be able to get them at a muffler shop.

Edit: your cam is a little smaller than mine, CR and rocker ratio about the same, I'm running 1-3/4's

Russ (RJ)
The Garlic Capital, Gilroy,CA

(sold June 15,2014) 1968 RS convertible that is not quite stock

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