header ? for my Ls2
Originally Posted by xphantomws6x
Well he might know if you told us some more info? Asking for a type of header while hiding your setup probably isn't the best idea if you want to get good answers.
Up until this post, it looked like you were going with a stock ci LS2 block, and LS6 heads ... in which case you would prob wanna stick with the 1 3/4" .... now if you're going with a 402ci LS2, with big heads and a big cam ... you'd want the 1 7/8".
See how that works?
Up until this post, it looked like you were going with a stock ci LS2 block, and LS6 heads ... in which case you would prob wanna stick with the 1 3/4" .... now if you're going with a 402ci LS2, with big heads and a big cam ... you'd want the 1 7/8".
See how that works?
Ditto that!
Originally Posted by Order 66
For the love of god, Kooks does not make QTPs. Get your facts straight. I dont care what Kooks says, it aint true.
1 3/4 QTP HVMC is all you need. You dont need 1 7/8.
1 3/4 QTP HVMC is all you need. You dont need 1 7/8.
You get YOUR facts straight! I ordered a set from kooks and they came with "QTP" Tags on them in a kooks box!!!! I was pissed and called kooks and he told me that it was the same header, THEY MAKE THEM. The collector was a little longer on the "QTP" made by kooks! Any other questions? Also I ran a 1 7/8 to 2'' . On my 408 I made 528hp ran 10.30's on motor and low nines on spray. What kind of motor do you have to base your opinion off of?
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Launching!
Joined: Aug 2004
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From: Ashland, Ky
Originally Posted by LASTLS1
You get YOUR facts straight! I ordered a set from kooks and they came with "QTP" Tags on them in a kooks box!!!! I was pissed and called kooks and he told me that it was the same header, THEY MAKE THEM. The collector was a little longer on the "QTP" made by kooks! Any other questions? Also I ran a 1 7/8 to 2'' . On my 408 I made 528hp ran 10.30's on motor and low nines on spray. What kind of motor do you have to base your opinion off of?
I agree, i called TSP and he said that the 1 7/8 would be the best and yes I agree, what kind of motor to base that with?
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From: MN
Originally Posted by Kounsy
How do u know what kind of setup im going with, the only thing u know is a 402
both these headers were 1 3/4 in.
myron c
Last edited by TPiS; Mar 23, 2006 at 01:22 PM.
Thread Starter
Launching!
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From: Ashland, Ky
Originally Posted by TPiS
I realize that all the info you gave was the cid. We build all size LS engines, In my opinion if it has a license plate on it regardless of cid a ! 3/4 primary will out perform a larger tube size. and extremly long primarys don't make power in the racing rpm range. I am going to attach a file of a independant test that was done by a GM engineer of our header vs LG long tubes. the base engine was a SCCA World challenge LS 2, These make approx. 575 hp.
both these headers were 1 3/4 in.
myron c
both these headers were 1 3/4 in.
myron c
Well its my bad on the lack of info starting this thread, Why does everyone with a 402 or bigger going with the 1 7/8 and not 3/4? I would see the 3/4 prob have more tq but the 7/8 would make more hp? I really just want the best performance for the strip. I appreciate everyone who has reply to this thread.
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Thread Starter
Launching!
Joined: Aug 2004
Posts: 248
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From: Ashland, Ky
Originally Posted by Louis
How radical of a 402? What weight? Auto or 6 speed?
250/258 .614 .614 108 lsa, cnc ported ls6 heads, fast 90, 10.9.1 compression with a -14cc valve relief
Originally Posted by TPiS
I realize that all the info you gave was the cid. We build all size LS engines, In my opinion if it has a license plate on it regardless of cid a ! 3/4 primary will out perform a larger tube size. and extremly long primarys don't make power in the racing rpm range. I am going to attach a file of a independant test that was done by a GM engineer of our header vs LG long tubes. the base engine was a warmed over LS 2 making approx. 575 hp.
both these headers were 1 3/4 in.
myron c
both these headers were 1 3/4 in.
myron c
I don't understand .... can you support your arguement that the 1 3/4 tubes will outperform the 1 7/8's? I'm not saying you're wrong, but I need a new set of headers for my 402 and I am trying to decide what I need as well.
Seems that everyone else I have talked to, including LG, seem to think that a 402ci = 1 7/8, end of story. You are the only person that thinks that is overkill, and I am interested to hear why.
Also, comparing LG's 1 3/4 to your 1 3/4 does not show us that 1 3/4 is better than 1 7/8 ....
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From: MN
Originally Posted by xphantomws6x
I don't understand .... can you support your arguement that the 1 3/4 tubes will outperform the 1 7/8's? I'm not saying you're wrong, but I need a new set of headers for my 402 and I am trying to decide what I need as well.
Seems that everyone else I have talked to, including LG, seem to think that a 402ci = 1 7/8, end of story. You are the only person that thinks that is overkill, and I am interested to hear why.
Also, comparing LG's 1 3/4 to your 1 3/4 does not show us that 1 3/4 is better than 1 7/8 ....
Seems that everyone else I have talked to, including LG, seem to think that a 402ci = 1 7/8, end of story. You are the only person that thinks that is overkill, and I am interested to hear why.
Also, comparing LG's 1 3/4 to your 1 3/4 does not show us that 1 3/4 is better than 1 7/8 ....
The very best header would be a nascar style step with three merge collectors per bank. around $3500.00 for a set. I would be glad to have a phone discussion with you. to see what your combo needs.
952 448 6021 myron c
Originally Posted by TPiS
The larger the tubes for a given engine the lazier it will be at the lower end of the rpm scale.say from an idle to 3500 rpm, This is on a light throttle roll on. The dynamics change at full throttle. so you need to determine if what you want is a dyno queen or a car that has crisp part throttle response.
The very best header would be a nascar style step with three merge collectors per bank. around $3500.00 for a set. I would be glad to have a phone discussion with you. to see what your combo needs.
952 448 6021 myron c
The very best header would be a nascar style step with three merge collectors per bank. around $3500.00 for a set. I would be glad to have a phone discussion with you. to see what your combo needs.
952 448 6021 myron c
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From: MN
test results To be honest with you it has been some time since I personally tested a set of 1 7/8 on a gen 3. maybe 1998. our specialtie is road racing were endurance is important. We were the top Corvette at this years Rolex 24 hr for instance. At this year Sebring race our motor set a new track record and sat on the pole. one of these were an LS-6 and the other a LS-2. both had 1 3/4 headers. I have attached a dyno sheet of a LS-2 based 427, 243 casting heads, 10.5 to 1 cr. pump 91 octane, our TPIS OVAL LS-6 intake, TPIS 1 3/4,
TPIS ZL-15 cam 236-241 .602 .567 on 112. This motor is for a STREET driven 4x4 auto. This same motor combo with with a larger cam will make over 665 hp.
MYRON C
TPIS ZL-15 cam 236-241 .602 .567 on 112. This motor is for a STREET driven 4x4 auto. This same motor combo with with a larger cam will make over 665 hp.
MYRON C
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From: MN
Originally Posted by TPiS
I will try again in the morning. I thought it had uploaded.
mc
mc
www.hpfarm@aol.com
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From: MN
Originally Posted by TPiS
Originally Posted by TPiS
Could read the dyno sheet.
mc
mc