Big Block Chevy Headers - Header Test

Using a 700hp 540 Chevy, we test a bunch of different headers to show how primary pipe and collector sizes make a difference in power.There's been a lot written about optimizing header design, but most of us can't afford one-off, custom-built, ideal-for-the-combination headers. Realistically, we use what we can buy over the counter. At least for popular V-8 engines and chassis, major header companies such as Hooker (a division of Holley) often offer a whole passel of tube sizes. This is definitely the case for the venerable big-block Chevy, on which we recently had the opportunity to put five different header sizes to the test on Westech Performance's SuperFlow 902 engine dyno. The headers had primary tubes ranging from 13/4 all the way to 21/4 inches, including one set with adjustable, variable-length primaries.


Photo Gallery: Big Block Chevy Header Horsepower Test - Hot Rod Magazine


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