kooks headers WOW
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Teching In
Joined: Jul 2004
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kooks headers WOW wow what a difference the 1 7/8 headers made on my car . sounds like a new car. and im not shitting you. its asome can not wait tilli hook up the wires to my qtp cutouts that are at the end of the straight dual pipes!!!
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6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
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From: Texas
Correct. You don't need more then 1 3/4 till you get big.
Header pipe length (in inches) = ((850*(360-EVO))/RPM – 3
Header diameter (in inches) = ((cylinder. disp. * 16.38 / ((hdr len + 3) * 25))) * 2.1
EVO is exhaust valve opening @ .006
RPM is peak HP rpm.
Header pipe length (in inches) = ((850*(360-EVO))/RPM – 3
Header diameter (in inches) = ((cylinder. disp. * 16.38 / ((hdr len + 3) * 25))) * 2.1
EVO is exhaust valve opening @ .006
RPM is peak HP rpm.
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TECH Apprentice
Joined: Jun 2002
Posts: 321
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From: Bowling Green, KY
I personally dynotested 1 7/8 to make more power than 1 3/4 on every car i tested. Even at 1200 rpm it makes more trq and power. I tested 1 7/8 kooks everytime over their own 1 3/4 and others 1 3/4. Don't make a mistake, get 7/8 that way your covered until the big motor comes.
Originally Posted by PopaPork
On a stock LS1 would 1 7/8's be to big?
I would be interested in seeing a dyno graph of this. Not because I don't believe you, but because I want to know whether it gained all over the powerband or just peak power. Did it lose power anywhere? I'm specifically talking about a heads/cam car N/A stock bore and stroke.
Originally Posted by TEA Brent
I personally dynotested 1 7/8 to make more power than 1 3/4 on every car i tested. Even at 1200 rpm it makes more trq and power. I tested 1 7/8 kooks everytime over their own 1 3/4 and others 1 3/4. Don't make a mistake, get 7/8 that way your covered until the big motor comes.
FWIW in a recent Car Craft, Hotrod, or GM High Tech Performance (I can not remember which) they tested stock manifolds, 1-5/8, 1-3/4, and 1-7/8 headers on a LS1 and the 1-7/8 headers made the most HP and torque.
I know if I ever get rid of my MAC headers I will be going with 1-7/8 headers.
John
I know if I ever get rid of my MAC headers I will be going with 1-7/8 headers.
John
1 7/8" even on a bone stock internal LS1? No losses anywhere?
I wonder now if the same would apply to using a FAST 90mm intake manifold with a 90mm TB, also historically thought to be too much for a stock internal 346. Hmm.
I wonder now if the same would apply to using a FAST 90mm intake manifold with a 90mm TB, also historically thought to be too much for a stock internal 346. Hmm.
Originally Posted by JNorris
FWIW in a recent Car Craft, Hotrod, or GM High Tech Performance (I can not remember which) they tested stock manifolds, 1-5/8, 1-3/4, and 1-7/8 headers on a LS1 and the 1-7/8 headers made the most HP and torque.
Originally Posted by LS1LT1
1 7/8" even on a bone stock internal LS1? No losses anywhere?
I wonder now if the same would apply to using a FAST 90mm intake manifold with a 90mm TB, also historically thought to be too much for a stock internal 346. Hmm.
I wonder now if the same would apply to using a FAST 90mm intake manifold with a 90mm TB, also historically thought to be too much for a stock internal 346. Hmm.
Originally Posted by 777
yes...you shouldn't need bigger than 1-3/4 unless you go bigger cubes