The same size iron heads make more horsepower than aluminum but how much i dont know if ist only a couple(witch i think it is)they say 100pounds is a tenth so a set of iron heads weighing almost 100pounds and aluminum weighing what?like 30 or 40 pounds you should be ahead still.Also aluminum heads do dissapate heat much better so this can be a very critical thing if your planning on supercharging it later.
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91GT Flowmaster 2 chambers,off road H pipe,mac equalength headers,F303 cam,high lift valve springs ,svo 1.6 roller rockers,16*timing,410's,BBK cold air kit,hurst shifter, Pullys,World class T5 MSD 6al box. Ran 13.5@101 with stock headers and air box.
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