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 Post subject: Header Tube Size?
 Post Posted: Wed Apr 06, 2011 7:50 am 
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Gonna have to have another set of headers to fit the dragster so I'm looking for info on what size tubes to use and how long they need to be. The ones on the Camaro now were larger than normal because I run mufflers mounted back in front of the rear axle but on the dragster that won't be the case. I was thinking that I need to drop back from that 2 1/8" primary to maybe a 2" stepped to 2 1/8' into 3.5" collector. Don't think I can go smaller than 2" because of the size and shape of the exhaust ports.

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 Post subject: Re: Header Tube Size?
 Post Posted: Thu Apr 07, 2011 10:31 am 
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Pipemax had the 447 using 2" to 2 1/8" steps, I can run your info if you want, post as much as you have on it. Length will have to do with the RPM range.


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 Post subject: Re: Header Tube Size?
 Post Posted: Thu Apr 07, 2011 11:09 am 
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434 CI 4.155/4.0
heads flow 370/250, 2.150/1.6 valves
cam is 110*LSA, 276*/290* @ .050 and is in at 106*
actual lift at the valve .708/.722
single Dominators w/1150 methanol and 1050 gas

shift point in the past has been just under 8,000 RPM although
I don't know what it will be since I moved the cam from 110* to
106*

primary fuel will be methanol with race gas run in early spring and
late fall.

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 Post subject: Re: Header Tube Size?
 Post Posted: Thu Apr 07, 2011 1:32 pm 
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 Post subject: Re: Header Tube Size?
 Post Posted: Thu Apr 07, 2011 1:34 pm 
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At 105 VE it put HP at the very lowest 756, low at 787, average 803, and best at 818.


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 Post subject: Re: Header Tube Size?
 Post Posted: Thu Apr 07, 2011 2:39 pm 
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jmarkaudio wrote:
At 105 VE it put HP at the very lowest 756, low at 787, average 803, and best at 818.


CrewChief Pro has been giving me numbers in the 800 to 810 HP range on a good day so they're not very far apart.

Lot of numbers there? So if I'm reading this right it looks like 2" to 2 1/8" step to a 4 inch collector is about it then? :-k

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 Post subject: Re: Header Tube Size?
 Post Posted: Thu Apr 07, 2011 2:47 pm 
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2" to 2 1/8" pipe, 14" length per step, 28" overall, and looks like a 4" collector will be close, 15" or 7.5" long.


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 Post subject: Re: Header Tube Size?
 Post Posted: Thu Apr 07, 2011 3:10 pm 
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Probably have to do the 7.5" collector as the 15 incher would be hard to incorporate in a down swept header. Plan is to try to find a header kit and build them myself.

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 Post subject: Re: Header Tube Size?
 Post Posted: Fri Apr 08, 2011 9:15 pm 
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Did you get that TIG yet? You know stainless is easier to TIG than mild steel. I'm just sayin' =;

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 Post subject: Re: Header Tube Size?
 Post Posted: Fri Apr 08, 2011 10:41 pm 
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Slowpoke wrote:
Did you get that TIG yet? You know stainless is easier to TIG than mild steel. I'm just sayin' =;


Yeah I knew that SS was somewhat easier to TIG but it's also VERY expensive! Guess the TIG stuff will get here tomorrow or Monday. Now all I need is an AC/DC welder and an argon bottle. TMC has a MIG welder that I could use also. I have options.

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 Post subject: Re: Header Tube Size?
 Post Posted: Sat Apr 09, 2011 8:08 am 
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Ken,

I have a set of FabShop headers for my 18 degree headed Sbc. 427ci engine shift 7800 rpm trap 8200 rpm. They are 2 inch to 2.125 step with a 3.5 inch x 8 inch long collecter. The step is right at 14 inches,with a 28 inch long tube. I know that the FabShop has weld up kits and so does Stahl headers. There also is somebody else that makes mostly headers for circle track cars that makes dragster headers. Bob


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 Post subject: Re: Header Tube Size?
 Post Posted: Sat Apr 09, 2011 8:32 am 
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Bob are you trying to sell me ANOTHER set of heaters or just quoting specs? :-k =; Remember, I bought the last set I had from you and I let them go with the car when I sold it.

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 Post subject: Re: Header Tube Size?
 Post Posted: Sat Apr 09, 2011 2:55 pm 
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No I am going to sell this set! I was just giving you the specs on my headers as a starting point. Because we both run 18 degree headed SBC about the same ci. They cost me $1350.00 shipped to my house with black ceramic coating and pan e-vac tubes.Plus my headers are Brodix spread port,I do not know if they will mate up to your Dart heads. Bob


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 Post subject: Re: Header Tube Size?
 Post Posted: Sat Apr 09, 2011 3:30 pm 
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scoop wrote:
They cost me $1350.00 shipped to my house


That's probably the reason I'll buy a kit and make them myself. Slowpoke sent me a TIG attachment and I've also got a friend with a small MIG welder so between the two I should be able to build a set myself. Buying a car, a trailer, headers and various other assorted "stuff" is running me out of money pretty quick especially since I haven't sold the Camaro yet.

But yeah, the specs on yours looks to be about the same as what I need to build. Dynatech has a kit for $289 so that looks pretty good about now. ;-)

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