Stock for stock, the iron heads flow better, but only have pressed in studs, so you are limited to the amount of lift you can run (like less than .500, IIRC). But the aluminum heads are easier to port/clean-up/gasket match at home and they already have screw in studs...
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Bill "The Verb" Crovo - Resident Car Slut &
Unicorn Hunter A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V...
American Ricerwww.badassofne.net
"Ooooh! Look! Something shiny!"NO MORE UNICORNS!!!!!LOWER IT!!!