408ci & stock ls1 manifolds, how much will it hurt?
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408ci & stock ls1 manifolds, how much will it hurt?
I am looking at getting a 408, but I don't have the extra money to change my ls6 intake or my stock manifolds, how much will this hurt me hp wise? Should I expect somewhere around 450rwhp? I would think it should be able to get that in my car, what do you all think?
The engine has:
Stage III Patriot LS6 style heads with 2.08/1.60's and patriot dual springs, 62cc Chambers
Comp 244/248 .612/.615 113lsa cam
10.7-1 CR
The engine has:
Stage III Patriot LS6 style heads with 2.08/1.60's and patriot dual springs, 62cc Chambers
Comp 244/248 .612/.615 113lsa cam
10.7-1 CR
#3
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The stockers flow decent enough, you'll be ok. You already know you power will be compromised a little but it won't "hurt" anything. Upgrades are done in steps. You start with the foundation and build up. Your looking at it the right way. Solid shortblock to start then add to it as budget permits. Cant honestly say what rwhp your looking at though, but it certainly wont be a dog.
We build stout 408's, I'd be more than happy to write a quote for you.
We build stout 408's, I'd be more than happy to write a quote for you.
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I would be doing the other boltons first, but I've come across a deal that I can't pass up. So, with that in mind, back to the question. How much hp will the stock manifolds be holding me back? 20? 30? 40?
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i did this on my vette, i put down 460 RWHP with an LS6 manifold and stock Z06 exhaust manifolds. i was also on stock injectors as well.
im running hogged out ls6 heads and a koneig 408.
switching to a FAST 90/90 setup netted me an extra 7-8 MPH at the track
im running hogged out ls6 heads and a koneig 408.
switching to a FAST 90/90 setup netted me an extra 7-8 MPH at the track
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#8
FormerVendor
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If you can afford the 408, save up another month and buy some LT's before you put it in. I don't know exactly what manifolds would do to a 400+ cubic inch motor but I have seen the way they kill a heads/cam car and there is NO way I would put manifolds on a big cube motor. If nothing else, throw a set of uncoated Pacesetters for the time being. You will be happy you did.
Jon
Jon
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The headers I want are the 1-7/8" headers by Texas Speed, $479, and I have an '01 so I have the LS6 intake. So where do you get headers for $200? I am stretching my finances to get this engine, but I couldn't pass it up. It will be in next week, I'll have to dyno it and see how it does.
#13
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So are you budgeting in a tune as well? Buy the shortblock but wait to install and tune for the headers i would say. You can run it if you are dead set on it, it will just not be entirely optimals. Are you running stock exhaust and cats? Alot of the turbo guys run stock truck manifolds so i cant imagine theyd be too bad. They are no where near as bad as stock LT1 manifolds from what ive seen.