Which Kooks should I get?
Originally Posted by Z28XTC
I have the 1 7/8s and I have plenty of lowend TQ plus if you get bigger cubes like a 383stroker in the future the 1 7/8s will help you pick up more power.
BTW those sparco's look killer I am going to get some evo XLs this year and I was wondering did you use the sparco rails if so how were they?higher or lower etc?
BTW those sparco's look killer I am going to get some evo XLs this year and I was wondering did you use the sparco rails if so how were they?higher or lower etc?
Chrispy says,
Unless you are planning above 400ci I would stick with the 1 3/4. You'll trade a lot of midrange (sometimes 30#s torque) for "maybe" 5-10 above 6Krpm.
What if you planning a 383 like me? I thought more cubes were a good thing with 1 7/8s? I didnt know it had to be 400ci or bigger to get the benefit of having the bigger headers.
Unless you are planning above 400ci I would stick with the 1 3/4. You'll trade a lot of midrange (sometimes 30#s torque) for "maybe" 5-10 above 6Krpm.
What if you planning a 383 like me? I thought more cubes were a good thing with 1 7/8s? I didnt know it had to be 400ci or bigger to get the benefit of having the bigger headers.
Chrispy says,
Unless you are planning above 400ci I would stick with the 1 3/4. You'll trade a lot of midrange (sometimes 30#s torque) for "maybe" 5-10 above 6Krpm.
What if you planning a 383 like me? I thought more cubes were a good thing with 1 7/8s? I didnt know it had to be 400ci or bigger to get the benefit of having the bigger headers?
Unless you are planning above 400ci I would stick with the 1 3/4. You'll trade a lot of midrange (sometimes 30#s torque) for "maybe" 5-10 above 6Krpm.
What if you planning a 383 like me? I thought more cubes were a good thing with 1 7/8s? I didnt know it had to be 400ci or bigger to get the benefit of having the bigger headers?
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TECH Senior Member
Joined: Nov 2001
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I ran a 385ci combo and went with a 1 3/4 to 1 7/8 header. It made great torque (400RWTQ at 3000rpm) through cats. (I ran the edelbrocks)
If you are running a blower I would go 1 7/8th for sure on stock displacement. 7#s of boost is effectively increase your displacement by close to 50%.
You want to maximize area under the curve and not just peak RWHP to go fastest. Especially in the heavier f-body's we drive. (We aren't drag racing 2500 pound cars with 5.13 gears and 5000 stall converters turning 8000prm)
If you are running a blower I would go 1 7/8th for sure on stock displacement. 7#s of boost is effectively increase your displacement by close to 50%.
You want to maximize area under the curve and not just peak RWHP to go fastest. Especially in the heavier f-body's we drive. (We aren't drag racing 2500 pound cars with 5.13 gears and 5000 stall converters turning 8000prm)
Im bringing this back cause I think im ready to order some headers. The setup im looking to most likely run would be a MS4 cam, PRC 2.5 5.3l heads, fast 90/90. Later on I might run a 150 shot on top of that but not sure if I will want too. Anyway do you think it would be best to run the 1 3/4 with that setup to try and keep a little low end power or just move up to the 1 7/8? I could also run the 1 3/4 stepped to 1 7/8 but they cost even more.
I've got (or will have once I get it back together in a week or so) about the exact same setup you have. Perhaps the only difference will be the cam. However, I just ordered my Kooks on Tuesday and I went with the 1 3/4" X 3" SS race headers...
From what I've read and what Kooks recommended, this should be more than ample for my setup.
And...I understand that 1 7/8" are a little harder to install...and might require some modification to the K-member, etc...
Good luck with your decision!
From what I've read and what Kooks recommended, this should be more than ample for my setup.
And...I understand that 1 7/8" are a little harder to install...and might require some modification to the K-member, etc...
Good luck with your decision!
