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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 866734, member: 8143"] Not trying to be a d*ck but I get tired of people saying that "well I put aluminum heads on my small block and it lost torque and gained hp" That's because of the port design, chamber and port volume, combustion cc and how that all reacts using atmospheric pressure to force it in the cylinder. Not because they were aluminum, it was the design of the head. I can tell you there would be maybe 1% difference because of the material it's made out of, all other factors kept exactly the same. So generally saying that being aluminum makes hp just because of the material is wrong. I agree with the rest. Of course header length, volume and design makes difference. And an x-pipe works because of scavenging affects and pressure equalization on banks of exhaust on a non turbo application. But it doesn't mean having a stainless exhaust will make more power over aluminized exhaust. I just don't want people here thinking a general statement that aluminum heads make hp and cast iron makes torque. Especially when you can't prove it or have no other reason than "heat dissipation". [/QUOTE]

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