This may sound silly
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
I have not seen any since the introduction of the catalytic converter... the reason is the catalytic has to run very hot to do to the convertation of the gases, it is so named because it converts the three main pollutants in automobile exhaust: carbon monoxide, unburned hydrocarbon and oxides of nitrogen. The first two undergo catalytic combustion and the last is reduced back to nitrogen... but it has to run hot, and long tube headers do not do this well. back in 1972, my Jeep CJ5 had headeres with the ports built in for the smog pump. but shortly after that the catalytic converter was introduced and thoes headeres went way..
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
Part B of that is that most of the guys that run headers have already thrown the AIR pump in the trash, thinking they were improving things.
it does improve things at upper RPM with flow, thus more HP.... but does nothing much at low RPM's
it does improve things at upper RPM with flow, thus more HP.... but does nothing much at low RPM's
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Team Owner
Joined: Jan 2007
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From: Southern Cal Ca
St. Jude Donor '22
Le Mans Master
Joined: Mar 2008
Posts: 5,948
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From: Oxford MA-----You just lost the game!!!!
Just about any header can be modified to accept those pipes, you'll just have to throw some money at it. How much? Couldn't say. I can't imagine it would be that much, though.
Scott
Scott
Drifting
Joined: Jul 2007
Posts: 1,889
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From: Kansas
Yes Sir; General motors had a production set of Stainless Steel, block huger headers, on the 1981, 1982, & 1980 Cal. 305 Corvette's. Bolt right on with the Air Pipes welded in by the Factory. G. M. stated that it added around 14 H. P. There are some still around on the Corvette Forum. & I think one guy is taking them, adding Powder Coat, & reselling them. I Have a couple sets myself. Which I coated with Por 15 header paint. You can tell the added H. P. is there. Have a great one. Gene
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
Yes Sir; General motors had a production set of Stainless Steel, block huger headers, on the 1981, 1982, & 1980 Cal. 305 Corvette's. Bolt right on with the Air Pipes welded in by the Factory. G. M. stated that it added around 14 H. P. There are some still around on the Corvette Forum. & I think one guy is taking them, adding Powder Coat, & reselling them. I Have a couple sets myself. Which I coated with Por 15 header paint. You can tell the added H. P. is there. Have a great one. Gene
Thread Starter
Instructor
Joined: Jun 2012
Posts: 192
Likes: 0
Yes Sir; General motors had a production set of Stainless Steel, block huger headers, on the 1981, 1982, & 1980 Cal. 305 Corvette's. Bolt right on with the Air Pipes welded in by the Factory. G. M. stated that it added around 14 H. P. There are some still around on the Corvette Forum. & I think one guy is taking them, adding Powder Coat, & reselling them. I Have a couple sets myself. Which I coated with Por 15 header paint. You can tell the added H. P. is there. Have a great one. Gene
Pro
Joined: Nov 2012
Posts: 672
Likes: 0
From: Chesapeake Virginia
there are long tube headers with air tubes in them available, they also sell a "kit for installing the air tubes in just about any brand of headers. the headers that are built with the air tubes are expensive but available. you may have to call summit, they don't list them on the site but they can get them.
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
there are long tube headers with air tubes in them available, they also sell a "kit for installing the air tubes in just about any brand of headers. the headers that are built with the air tubes are expensive but available. you may have to call summit, they don't list them on the site but they can get them.
Racer
Joined: Oct 2003
Posts: 424
Likes: 9
From: Killeen Texas
My '81 came w/ those stainless block hugger headers, and w/ the air tubes. I took them off and installed long tube headers. Got rid of all the smog devices. I still have them laying around if you're interested. They supposedly flow better than the cast manifolds and are a lot lighter.
Le Mans Master
Joined: Feb 2011
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From: Southern NH
Drifting
Joined: Jul 2007
Posts: 1,889
Likes: 23
From: Kansas
Yes Sir; Thanks for asking, but no, I want to keep them handy just in case. I have thought about installing them on my 77. I also have a set of 2.5 inch off a 1986, I don't know if they will fit or not. texas jim is the guy you want to talk to. Have a great one. Gene
Thread Starter
Instructor
Joined: Jun 2012
Posts: 192
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I'm sorry if I seem like i am dragging this out but, if i go with them (the factory shorties) ill see about 15 HPs right vs. about 30 for longtubes, and the factories are a better fit up, and with out the heat issues?