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Old 03-10-2017, 04:34 PM   #1
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I have had a 68 camaro thats been stock for about 10 years. I finally decided to put a LS in. I got a LQ4 from a salvage yard, rebuilding it top to bottom bore 4.030 4Ē stroke 6.125 rods, fast LSXR intake, 102mm TB. The problem Ive run into is the flowmaster scavenger headers 814115 (https://www.summitracing.com/parts/flo-814115) from an article I read that I cannot even find anymore, were about as good as it gets NA, are discontinued. I canít find them anywhere. Ive literally charged around $650 on my card then had it refunded around 20 times. I've shopped around a little bit and most everything I've found worth a crap seems to be double that. Does anyone have any suggestions? I do know I want to stick with 1 3/4"-1 5/8" stainless and not coated mild steel because I might not change anything else for another 10 years. Or if anybody knows where I could find a set that would work to.
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Old 03-10-2017, 05:44 PM   #2
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With a 408"engine that your building you'll want at least 1-3/4" headers. Speed Engineering offers some stainless swap headers https://www.speed-engineering.com/ls...2-ls3-ls6.html hopefully I copied the right link. Look around their site they have a few options. I personally havent used them but i think I saw them used in the conversion section. Look around the conversion section and you'll find plenty of ooptions.
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Old 03-10-2017, 05:54 PM   #3
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These are bigger tubes than what you wanted but are stainless and priced pretty good.

https://www.texas-speed.com/p-4273-t...1967-1969.aspx
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Old 03-10-2017, 06:07 PM   #4
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Wonder how a Dough Thorley set would compare?
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Old 03-10-2017, 10:59 PM   #5
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I actually looked at those. From what I've read the 1 7/8 loose a little HP and torque. But then the next guy will say it helped. I did go ahead and have my rings spaced for a pro charger. Would the bigger headers be better later on when thats added?
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Old 03-15-2017, 08:05 AM   #6
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Quote:
Originally Posted by DirtyChevy View Post
I actually looked at those. From what I've read the 1 7/8 loose a little HP and torque. But then the next guy will say it helped. I did go ahead and have my rings spaced for a pro charger. Would the bigger headers be better later on when thats added?
You read wrong bro. You may have read right but what you read was wrong. An 1-7/8 header doesn't loose power anywhere on a stock LS1 and on a larger than LS1 engine you wouldn't want to run anything smaller than 1-7/8.

Im my opinion, you need to put the header size decision to bed and get 1-7/8 and forget about 1-5/8. These thing breathe way better than old school small blocks and there is years of research done to support what works best for these Gen 3 and up engines
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Old 03-17-2017, 09:33 PM   #7
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Yeah I was about to say I know how to read bro! But I kept reading. Yeah after searching again looks like your right. There's been way more side by side comparisons since the ones I was reading before and they've all had no loss to substantial gains with the 1 7/8. And for the price I'll have some Texas speeds ordered tomorrow.
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