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What are headers really worth? About 40rwhp it turns out..

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Old 12-02-2011, 02:01 PM   #1
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Default What are headers really worth? About 40rwhp it turns out..

Well I posted up here about some disappointing results with my car..
I've now deleted that thread instead of having two on the same subject / car.

I'm sure a lot of people wonder what headers are really worth on a modded car, and since I was dumb enough to do a build-up and save headers for last, I can tell everyone exactly what headers are worth on a normal street / strip car.
My mods are simple, and common for the LS1 world
Stock LS1 block 90 000+ miles
T56
LS6 intake
EPS 226/234, .598/.601 Cam
Hooker headers
Stock 243 heads
Comp Springs
All mods before headers: 347.89HP, after headers: 387.27HP

You can check out the dyno graph below.
Click the image to open in full size.
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Last edited by IRONFIST; 12-02-2011 at 03:18 PM..
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Old 12-02-2011, 02:15 PM   #2
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Yeah, that cam, especially being ground to favor the exhaust, was begging for some headers
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Old 12-02-2011, 02:57 PM   #3
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what size 1 7/8 or 1 3/4 ?
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Old 12-02-2011, 03:02 PM   #4
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Quote:
Originally Posted by bubulle View Post
what size 1 7/8 or 1 3/4 ?
1–3/4"
these ones:
PART #: 2468HKR
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1999 WS6, six speed, 6.0L, 243's, Fast 78, EPS 226/234 .598/.601, Hooker LTs, Texas speed Y pipe, Monster stage 3 clutch

Last edited by IRONFIST; 12-02-2011 at 03:19 PM..
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Old 12-02-2011, 03:03 PM   #5
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Quote:
Originally Posted by IRONFIST View Post
Well I posted up here about some disappointing results with my car..
I've now deleted that thread instead of having two on the same subject / car.

I'm sure a lot of people wonder what headers are really worth on a modded car, and since I was dumb enough to do a build-up and save headers for last, I can tell everyone exactly what headers are worth on a normal street / strip car.
My mods are simple, and common for the LS1 world
Stock LS1 block 90 000+ miles
T56
LS6 intake
EPS 226/234, .598/.601 Cam
Hooker headers
Stock 243 heads
Comp Springs
All mods before headers: 347.89HP, after headers: 387.27HP

You can check out the dyno graph below.
http://www.cardomain.com/gallery/aid983603#
that's more like it.now get a good lid on there and i bet you'll see 400+hp..
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Old 12-02-2011, 03:06 PM   #6
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Nice gains. Stock manifolds really hold back a cammed motor. I agree with the comment on the lid. Get a good lid and you should hit 400.
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Old 12-02-2011, 05:12 PM   #7
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You guys really think I can gain 13hp from just a lid? I'd love to hit that magic 400rwhp number but I don't know if it's possible. My engine mods are basically done at this point, there's a 75 shot of nitrous going in ( already have the kit ) and other then that I don't have any plans.
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Old 12-02-2011, 05:21 PM   #8
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1 7/8" would have shown even more gains.. definitely get a lid on there!! easy 10 hp probably if not more.. some tq to be had too
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Old 12-02-2011, 05:21 PM   #9
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To give you a reference I have a BBK intake, SLP lid &bellow ,TSP 228R cam, kooks 1 3/4 race headers they might be 1 7/8 not sure and a ASP underdrive pulley and got 401.72rwhp and 389tq.

So it can be done and my cam is smaller then yours.
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Old 12-02-2011, 05:32 PM   #10
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Quote:
Originally Posted by djfury05 View Post
1 7/8" would have shown even more gains.. definitely get a lid on there!! easy 10 hp probably if not more.. some tq to be had too
x2....
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Old 12-02-2011, 05:32 PM   #11
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Congrats, nice numbers from man!
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Old 12-02-2011, 07:10 PM   #12
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Ive seen that cam hit over 400 rwhp on stock 241s, I dont know if the lid is holding you back but IMO numbers are low with 243s and that size cam..
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Old 12-02-2011, 07:46 PM   #13
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Gotta love that cam, I do!
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Old 12-02-2011, 07:51 PM   #14
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Quote:
Originally Posted by mac62989 View Post
Ive seen that cam hit over 400 rwhp on stock 241s, I dont know if the lid is holding you back but IMO numbers are low with 243s and that size cam..
Crap... I think you may be right....
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Old 12-02-2011, 09:40 PM   #15
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Quote:
Originally Posted by IRONFIST View Post
Crap... I think you may be right....
sarcasm?
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Old 12-02-2011, 10:00 PM   #16
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No sarcasm, I just did some searching after reading the post and a lot of guys are making similar power to me with less mods. I think I have the lowest hp with this cam...
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Old 12-03-2011, 01:36 AM   #17
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Glad the numbers worked out for you!!!! I too did internal work before adding headers and saw similar results.
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Old 12-03-2011, 04:43 AM   #18
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Quote:
Originally Posted by IRONFIST View Post
No sarcasm, I just did some searching after reading the post and a lot of guys are making similar power to me with less mods. I think I have the lowest hp with this cam...
Don't worry about the dyno numbers.. go to the track and get a few consistent passes and see where the trap speed is.. then we can determine if there is an issue or if its running well
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Old 12-03-2011, 05:49 AM   #19
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Dyno #s dont mean crap u need to go to the Track !!!! I Had a 02 Camaro SS A4 Bolt-on car that Dynoed 325 to the tires and ran 11.80@114 !!!
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Old 12-03-2011, 06:12 AM   #20
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how do you not have a lid yet lol, you will feel a gain for sure once you put one on, check craigslist i saw 3 of them on there the other day ,they were all under 40 bucks
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Old 12-03-2011, 06:12 AM
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