Did you know: Many people don't pay attention to the compression ratio when going from cast iron to aluminum heads. Fact is that if everything else was equal the cast iron head would make more power than an aluminum head. Cast iron heads doesn't absorb heat from the combustion process as fast at aluminum heads, therefore more heat is available to push the piston down. The way to get back the lost horsepower is to up the compression on the aluminum head. Typically you can run about a half to full point more compression with an aluminum head over the cast iron.
Joes95GT said:All of that is very true. Theoretically, you can run more compression and timing with an aluminum head just because it resists detonation better than iron. You can't just mill an aluminum head because "you can run more compression with it". There is much more too it than that. Octane ratings, ignition timing, and cam timing all affect compression.
Joe
Joes95GT said:All of that is very true. The reason that companies like AFR and Edelbrock make only aluminum heads are because of the weight savings. Most people want an aluminum head because of the performance gains it offers but also because of the weight savings it provides. I don't know why Edelbrock or AFR don't make an iron version of their heads.
Theoretically, you can run more compression and timing with an aluminum head just because it resists detonation better than iron. You can't just mill an aluminum head because "you can run more compression with it". There is much more too it than that. Octane ratings, ignition timing, and cam timing all affect compression.
Joe
camaroguy72 said:You do not cast aluminum, it is machined like you said.
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