2 in kooks headers question
Race Director
Joined: Aug 2005
Posts: 13,592
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From: Hudson WI
NCM Sinkhole Donor
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
You typically lose bottom end with bigger headers. You not putting out enough power to need 2". Just my opinion
Take a look at this article.
http://www.superchevy.com/how-to/491...ower-increase/
Take a look at this article.
http://www.superchevy.com/how-to/491...ower-increase/
Former Vendor
Joined: Dec 2011
Posts: 1,475
Likes: 29
From: Salt Lake City Utah
1-7/8" are good up until about 800 RWHP, after that I suggest going 2". In reality, the ports in your heads are only so big and you'll lose velocity at lower RPM. You may gain a touch more peak HP, but low end will suffer; basically you'll just be shifting the powerband upward in the RPM range. So unless it's a very serious build, 1-7/8" will suit you best.
Feel free to call, PM or email us anytime with questions.
Best regards,
Tyler
888-308-6007
Feel free to call, PM or email us anytime with questions.
Best regards,
Tyler
888-308-6007
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Your losing power with the 1 7/8 the power from the nitrous will push out the tubes , go back to 1 3/4 you will have more power under the curve the gain is at 7000 rpm for the bigger tubes
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Thread Starter
Drifting
Joined: Sep 2014
Posts: 1,774
Likes: 38
1-7/8" are good up until about 800 RWHP, after that I suggest going 2". In reality, the ports in your heads are only so big and you'll lose velocity at lower RPM. You may gain a touch more peak HP, but low end will suffer; basically you'll just be shifting the powerband upward in the RPM range. So unless it's a very serious build, 1-7/8" will suit you best.
Feel free to call, PM or email us anytime with questions.
Best regards,
Tyler
888-308-6007
Feel free to call, PM or email us anytime with questions.
Best regards,
Tyler
888-308-6007
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Look at the the tq drop with the 1 7/8 then the tune we got a couple more 492 you can see the power gain was only at the highest rpm, dyno 64 65 1 3/4 dyno 67 68 1 7/8 dyno 66 doesn't show as just driving to let maff adjust
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
I did 1 3/4" for better torque, but never had dyno numbers to validate, so thank you!
Race Director
Joined: Mar 2005
Posts: 11,549
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From: Southampton NJ
I disagree for anything under 383 CI I tested a number of tube sizes and manufactures, try to get the extra et
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ