1 3/4'' or 1 7/8'' headers?
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
That comparison used two different header designs and showed something like +7/+5 at 6500rpm at the crank. At 3000rpm HP was the same and torque was -6. The weird thing was that the -6 was called insignificant while the +5 was significant. Bottom line is it was an apples to different apples comparison that showed moderate if any increase. Not a terribly compelling argument for 1 7/8 imo.
For what it's worth I've seen multiple threads on here where venders have said factory head with small valves benefit from 1 7/8 primaries and after market heads with bigger valves might be better off with 1 3/4.
Check out this thread
https://ls1tech.com/forums/dynamomet...-only-ls1.html
After the intake swap he switched to 1 7/8 headers. He only gained 9 peak hp but gained a bunch of torque across the curve
Check out this thread
https://ls1tech.com/forums/dynamomet...-only-ls1.html
After the intake swap he switched to 1 7/8 headers. He only gained 9 peak hp but gained a bunch of torque across the curve
https://ls1tech.com/forums/dynamomet...s-1-7-8-a.html
https://ls1tech.com/forums/generatio...o-results.html
I'm not trying to debate here or refire an old debate. This is all FYI on my part. I was given 1 3/4" as a gift from my girl, they are going on...but I'm also mamofied.
https://ls1tech.com/forums/generatio...o-results.html
I'm not trying to debate here or refire an old debate. This is all FYI on my part. I was given 1 3/4" as a gift from my girl, they are going on...but I'm also mamofied.
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Looks like I will be selling my 1 3/4 Kooks with a fresh Jet Hot coating. Headers havent been ran since I had them coated. Sterling Silver still shining inside & out!
Headers were ran for about 12k miles uncoated before taking them off. I am building a new motor so I sent them to Jet Hot to be coated and they have been waiting on me to finish the build.
I plan on putting them on the Parts Classified probably this weekend. $500 plus shipping and fees for used headers with a brand new coating. Again, the headers have not been ran since the coating.
Great thread, now to find 1 7/8 headers for my 550+ RWHP project!!
Chad
Headers were ran for about 12k miles uncoated before taking them off. I am building a new motor so I sent them to Jet Hot to be coated and they have been waiting on me to finish the build.
I plan on putting them on the Parts Classified probably this weekend. $500 plus shipping and fees for used headers with a brand new coating. Again, the headers have not been ran since the coating.
Great thread, now to find 1 7/8 headers for my 550+ RWHP project!!
Chad
Looks like I will be selling my 1 3/4 Kooks with a fresh Jet Hot coating. Headers havent been ran since I had them coated. Sterling Silver still shining inside & out!
Headers were ran for about 12k miles uncoated before taking them off. I am building a new motor so I sent them to Jet Hot to be coated and they have been waiting on me to finish the build.
I plan on putting them on the Parts Classified probably this weekend. $500 plus shipping and fees for used headers with a brand new coating. Again, the headers have not been ran since the coating.
Great thread, now to find 1 7/8 headers for my 550+ RWHP project!!
Chad
Headers were ran for about 12k miles uncoated before taking them off. I am building a new motor so I sent them to Jet Hot to be coated and they have been waiting on me to finish the build.
I plan on putting them on the Parts Classified probably this weekend. $500 plus shipping and fees for used headers with a brand new coating. Again, the headers have not been ran since the coating.
Great thread, now to find 1 7/8 headers for my 550+ RWHP project!!
Chad
