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There is a good book that you can get from a book store or possiblt from Summit or Jegs, It is called How to Build & Modify Cevrolet Small-Block Cylinder heads By David Vizard. To answer your question The Cross Sectional area of an intake port and the size of the engine determine the rpm range of every cylinder head, there are math formulas in the book that you can use to figure out your own heads. To answer the comment on the guys who know wont tell. It is more because you can spend eight hours talking about what makes a head work and why and still never know it all. Flow numbers are not always the best way to pick a head. Watch who runs good and find out who did the head work. There are a lot of as cast heads that work great for a lot less money than you would pay for port work and a good valve job. I have two Chevrolet powered Race cars and a 96 Z28 for a driver. My Malibu is a mid ten second car with a 331 inch motor with a head the most would use for scrap but I have more time in them than I should have spent. If you have any more questions just ask.
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