Re: 1 7/8 vs 2"
[Re: AndyF]
#3076763
09/12/22 10:47 PM
09/12/22 10:47 PM
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Joined: Mar 2003
Posts: 2,527 PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,527
PA
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I wouldn't use 2 inch headers unless the engine was making over 600 hp. Might not use the larger header until close to 700 hp. I have 2 inch on my engine and its making over 800 lol. Granted they are short, unequal length fender exit headers but they work. Sometimes too big of a header is just as bad as too small. Over the years every time I have had a header on the large side the 60 ft seems to have suffered.
Last edited by moparacer; 09/12/22 10:48 PM.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: 1 7/8 vs 2"
[Re: moparacer]
#3076788
09/13/22 01:53 AM
09/13/22 01:53 AM
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Joined: Nov 2003
Posts: 1,366 Out of the State of Confusion
blue_stocker
pro stock
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pro stock
Joined: Nov 2003
Posts: 1,366
Out of the State of Confusion
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Jere Stahl (Stahl headers) once told me in order to use a 2" primary that engine needs to make a minimum of 550 hp. Since he was the inventor/developer of the equal-lenght/4-into-one header, I think he kinda knew something there. I did some testing at Fremont in the early 90s with my stocker and that pretty much proved right, at least on a stock eliminator car...too big=loss of performance/slower et and mph. I never forgot his conversations nor some of the things he told me. Jere was one inovative and very smart cookie, right there with Harvey Crane, Ed Iskedarian, Bruce Crower, Racer Brown, Gene Winfield and many more of that generation.
I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them. Thomas Jefferson
Freedom must be repurchased by every new generation General Daniel Jones, WW2 Tuskegee Airmen
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Re: 1 7/8 vs 2"
[Re: dart games]
#3076803
09/13/22 07:30 AM
09/13/22 07:30 AM
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Joined: Dec 2021
Posts: 1,185 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,185
Loudoun County, VA
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FWIW, I had: - 1-3/4 on car when I bought it and kept them when it was a 12-sec car... 450-ish HP - switched to 1-7/8 when engine got upgraded to run into the low 11s... 550-ish HP - switched to 2" when another upgrade got solidly into the mid 10s... 600 HP - keeping the 2" w/ the new engine combo that's making 650+ HP
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: 1 7/8 vs 2"
[Re: quickd100]
#3076815
09/13/22 08:29 AM
09/13/22 08:29 AM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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If I remember right the Moparts Engine masters entry made it's best power/torque curve with some no name 1-7/8" headers. Years ago I spoke at length with Ed Henaman of Headers by Ed. One of the ideas he stressed was not to go to big with the tube size and was a great advocate of equal length tubes. Ed paid a lot of attention to the transition from tube to collector too. A lot ! But he made some nice headers. I bought a lot of parts from him over the years , but never had a combination that he made headers for.
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Re: 1 7/8 vs 2"
[Re: tubtar]
#3076864
09/13/22 10:57 AM
09/13/22 10:57 AM
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Joined: Jan 2003
Posts: 6,392 nielsville, minn.
quickd100
master
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master
Joined: Jan 2003
Posts: 6,392
nielsville, minn.
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If I remember right the Moparts Engine masters entry made it's best power/torque curve with some no name 1-7/8" headers. Years ago I spoke at length with Ed Henaman of Headers by Ed. One of the ideas he stressed was not to go to big with the tube size and was a great advocate of equal length tubes. Ed paid a lot of attention to the transition from tube to collector too. A lot ! But he made some nice headers. I bought a lot of parts from him over the years , but never had a combination that he made headers for. I gave him the details of my motor and chassis and he gave me the recs for tube size and lengths. I then bought the header kit from him. I went down to his shop to pick it up and that's a story in itself.
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Re: 1 7/8 vs 2"
[Re: AndyF]
#3076946
09/13/22 03:16 PM
09/13/22 03:16 PM
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Joined: Jan 2003
Posts: 13,400 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,400
Marion, South Carolina [><]
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I wouldn't use 2 inch headers unless the engine was making over 600 hp. Might not use the larger header until close to 700 hp.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 1 7/8 vs 2"
[Re: an8sec70cuda]
#3077157
09/14/22 09:33 AM
09/14/22 09:33 AM
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Joined: Jun 2006
Posts: 5,166 CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,166
CT
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The other thing on the 2 inch vs 1 7/8 deal is I don’t think you can go to a 2 inch without automatically getting a 3.5 inch collector
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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