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Originally Posted by best of both
There is a good book that you can get from a book store or possibly from Summit or Jegs, It is called How to Build & Modify Chevrolet Small-Block Cylinder heads By David Wizard. 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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A very good friend and customer of mine has a 1965 mustang super stock car NHRA the year before last he had the ( GUY ) as they are called do his heads and he got the national record for 2 or 3 months i think, its a 289 automatic 450 CFM orig 4 brl carb orig weight car 10:97 at a cost of $4500 for the porting alone, than the parts and valve job work -- i though this was the guy -- guys i was referring too -- been racing and doing this almost 35 years even guys i know 20 years or more do not talk about how they achieve high flow #s -- but maybe it happens you can walk up to a guy who you are racing and he is winning and ask him who does his work and he will tell you the truth ( right ) but today most like AFR will sell you a set of heads CNC Ported that will rival anything anyone is doing buy hand at a cost if 1/3 a head port shop would have charged you -- and i have a collection of very interesting math books on all the parameters you are looking at -- but you will get lost in a sea of confusion -- so many things are relative to so many other things -- dizzy is the term after reading, it does help but, keeping focus on the issue you started to look at becomes a blur -- you want to do some reading its all formulas or i can give you the name of the book and the author ( Tim ) and answer some questions but most of it is out their -- jz