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About 400$ Canadian worth. Corki Bell derived formula from some website. I'll post if I can get to my PC. Need to calculate your camshaft and ports and such. And I mostly used a cut to size to size welding rod to play with and figure out where to pass the tubes. It's not perfect what so ever but it gets it pretty close.
Calculate Header Tube Length and Diameter - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules!
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