indy "x" heads or edelbrock rpms?

70aarcuda said

They really don’t make more power-by themselves. Aluminum can dissipate heat better than cast iron heads, allowing the temperature in the chamber to be lower. This permits the compression ratio to be raised without raising the octane level in your fuel. The raised compression is what makes more power. Raising the compression still higher requires a switch to higher octane race fuels

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With all respect to you I disagree. Not with the theory but with the way it's written... Aluminum doesn't "allow cooling" of the chamber. By it's very nature it makes the chamber pull heat from the combustion process faster than iron. That takes away efficiency from the process. That's why the builder should raise the static ratio - to make up for that lost efficiency. But through the process of that raising you do not create a need for race fuel. In fact aluminum chambers are less prone to detonate at higher cylinder pressures. That's why I said a "clean slate" build the RPMs are my top choice. A good builder will make the same power given the same air flow, you still have to pay for valve job/assembly work, they are easier to port, and take a bit of weight off the nose especially in regard to the IndyXs. It's win, tie, win, win in my opinion.