Header selection

While searching for headers I ran into a great site and thought I'd pass it along.

GrumpysPerformance.com • View topic - calculating header design

For those who don't want to read it all or just want it boiled down to a result, there is a calculator that will tell you primary size, length, and collector size as well. That can be found here:

Primary Header Tube Length and Diameter Calculator

Running the numbers for a Ford 5.0 Aluminator XS it gave me:

Your Primary Tube Length is 29.25
Your Primary Tube Diameter is 1.72 inches
Your Collector Diameter is 2.99 inches Two Collectors

The primary size seemed one step too small based on past experience, so I called up Ford Motorsports to see what they had to say. In short, the said exactly what this calculator told me... 1.75" primaries and a 3" collector. The primary length they said they could not specify as it depends a bit on application.

So I am very confident that if you give this calculator the right input, it will give you the right output.

Hope this is helpful.
 
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