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post #1 of 5 (permalink) Old Aug 19th, 08, 09:18 PM Thread Starter
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steve
 
Join Date: Jul 2007
Location: Bay City Mich.
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headers

What is the opinion on long headers compared to the shorty style. Not the block huggers but the 3/4 type I guess you could say. Not racing the car just tooling around town.
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post #2 of 5 (permalink) Old Aug 20th, 08, 10:33 AM
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Matt
 
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Re: headers

The longer the header the more low end torque you get. Short headers make more horsepower. The key is to get a set of headers that have equal length tubes and the correct pipe diameter for your application. Coatings are an additional choice, but keep in mind most coated off the shelf headers are coated only on the outside.

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post #3 of 5 (permalink) Old Aug 20th, 08, 10:42 AM
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Andy
 
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Re: headers

What size is your motor? How much hp do you predict it to make? A 1 5/8" primary longtube tuned length header is usually the best for most apps. Displacements over 400 C.I. with more than 450 hp, i would recommend a 1 3/4" header. Also, do your research to make sure you get the best fitting set of headers possible. You don't want to have to dimple a new set of headers for clearance. I just bought a set of doug's D368 headers for my car this week. I'll post some pictures when I go home this weekend. They are a little pricey but I've heard really good things about the fitment of these headers.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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post #4 of 5 (permalink) Old Aug 22nd, 08, 08:27 PM
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Andy
 
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Re: headers

https://www.camaros.net/forums/showth...80#post1051280 pictures are now in this thread.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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post #5 of 5 (permalink) Old Aug 22nd, 08, 10:19 PM
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Join Date: Dec 2001
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Re: headers

Here's a thread where Rodney Davis of Headerdesign.com explains the difference between the two main types of headers.

https://www.camaros.net/forums/showthread.php?t=16596

So being very general, a low horsepower 350 CID V8 engine making only 1.5 horsepower per CID ( 525 hp ) may only require a primary tube size of 1 5/8"stepped to 1 ¾". This particular engine would only require a merged collector throat size of approximately 2 ¼" with a 3" outlet. The primary tube length is dictated by what RPM the engine is run at to obtain these power levels, with the vehicle weight, transmission, torque converter, and type of racing playing a dominating role.

Some good reading at http://www.perfweldheaders.com/techarticles.html

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