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Message: [QUOTE="sleeps, post: 866478, member: 6030"] The difference in material from cast iron to aluminum will make the power outcome different from heat dissipation alone. No matter any other factors. The aluminum is going to flex and move under heat and pressure too. That's why you sleeve aluminum blocks. Under stress the bores would warp and you would lose ring seal. Airflow and the laws of thermodynamics do not Carr if your engine is gas or diesel powered. I don't read this "crap" from a magazine. It is from personal experience. Now, do i have a flow bench or constant access to a dyno? No. Although you are right that most of what is in magazines are very very wrong. I if it came across that I was comparing head flow design to headers and exhaust systems, that isn't what I intended. I just meant there are certain factors at play to achieving whatever your end goal might be and that many go unnoticed. Like people thinking a header is a header, or any exhaust is exhaust but not know that a different type, design, small variation or material habe different outcomes and what is ideal for one person may not be ideal for what you want. [/QUOTE]

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