long and short headers
Melting Slicks
Joined: Jul 2005
Posts: 2,060
Likes: 46
From: winter haven florida
St. Jude Donor '12
the power curve and total increase in power. collector shape and size as well as primary length and size all work together to change tq curves and hp. the long tube is far superior.
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
After I switched to long headers (Dynomax ceramic coated from Summit), I suddenly had a carb problem. Breath in, breath out. The improvement in the breath-out part of the cycle created a too-lean problem on the breath-in end. I ended up upping the accelerator jets and accelerator pump cam on the Holley carb.
Most importantly, the performance improvement was obvious on my butt-o-meter.
El Camino
Joined: Aug 2006
Posts: 57
Likes: 0
From: Spring Texas
long tube headers
Would there be any problem installing long tube headers on my 74 small block ?
I am having my motor overhauled. The block is going to be decked, mild cam, flat teflon pistons, aluminum heads and intake.
But I was told that I have to run shortys because of the clearance ? My Corvette is stock suspension.
Is it possible to run long tube headers ??
I am having my motor overhauled. The block is going to be decked, mild cam, flat teflon pistons, aluminum heads and intake.
But I was told that I have to run shortys because of the clearance ? My Corvette is stock suspension.
Is it possible to run long tube headers ??
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
My understanding is long tube headers offer more top end power, by shifting torque peak higher in rpm range, whereas shorter length tubes provide slightly better lower rpm torque.
Tri-Y designs act as a good compromise, and give benefits across whole rpm range.
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Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Corvette SB manifolds are good for manifolds & shortys are mainfold replacements. May or may not make more power. Next up are compromise headers like 3/4 length & Tri-Y.
At the top for Corvette SB are full length Dynomax Cerma Coat & Hooker Super Comps.
At the top for Corvette SB are full length Dynomax Cerma Coat & Hooker Super Comps.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Would there be any problem installing long tube headers on my 74 small block ?
I am having my motor overhauled. The block is going to be decked, mild cam, flat teflon pistons, aluminum heads and intake.
But I was told that I have to run shortys because of the clearance ? My Corvette is stock suspension.
Is it possible to run long tube headers ??
I am having my motor overhauled. The block is going to be decked, mild cam, flat teflon pistons, aluminum heads and intake.
But I was told that I have to run shortys because of the clearance ? My Corvette is stock suspension.
Is it possible to run long tube headers ??
Team Owner
Joined: Apr 2002
Posts: 62,198
Likes: 1
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
That's a big statement.
My understanding is long tube headers offer more top end power, by shifting torque peak higher in rpm range, whereas shorter length tubes provide slightly better lower rpm torque.
Tri-Y designs act as a good compromise, and give benefits across whole rpm range.
My understanding is long tube headers offer more top end power, by shifting torque peak higher in rpm range, whereas shorter length tubes provide slightly better lower rpm torque.
Tri-Y designs act as a good compromise, and give benefits across whole rpm range.
Readily available long tube headers are tuned for higher RPM motors.
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
Would there be any problem installing long tube headers on my 74 small block ?
I am having my motor overhauled. The block is going to be decked, mild cam, flat teflon pistons, aluminum heads and intake.
But I was told that I have to run shortys because of the clearance ? My Corvette is stock suspension.
Is it possible to run long tube headers ??
I am having my motor overhauled. The block is going to be decked, mild cam, flat teflon pistons, aluminum heads and intake.
But I was told that I have to run shortys because of the clearance ? My Corvette is stock suspension.
Is it possible to run long tube headers ??
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Primary pipe diameter and collector configuration/length have more imact than anything else (primary length, equal-length) in most street engines -those producing <1.5hp/ci na. Length becomes an influence when you are tuning in a very narrow power band. Equal length is pretty much a non-issue if you aren't running a 180-degree header or a flat crank.
There are always design compromises, though. There is no long-collector, short-tube street header I've ever seen. So you run a shorty with no collector to speak of, or you run long tubes with a suitable collector.
Race engines are something else entirely.
There are always design compromises, though. There is no long-collector, short-tube street header I've ever seen. So you run a shorty with no collector to speak of, or you run long tubes with a suitable collector.
Race engines are something else entirely.