Dynamic Compression and Aluminum Heads?

JGC403 said
I know this has been discussed a lot on here, but I wasn't able to find an answer for my question.

With aluminum heads they say you can generally raise the static compression ratio 1 point because the aluminum dissipates heat quicker.

Now when you are inputting all of your variables into a dynamic compression ratio calculator what compression ratio would you put for aluminum heads.

SO lets say your calculated compression ratio is 10:1, but you are using aluminum heads so it basically has 9:1 compression ratio.

In the dynamic compression ratio calculator do you input your calculated 10:1 ratio or your "effective" 9:1 ratio for aluminum heads?

It doesn't work that way. At all. 10:1 is 10:1 is 10:1 regardless of what the heads are made of. The head material has nothing to do with compression ratio. Nothing. Nada. Zilch. Zero. It will have 10:1 even if the heads are made out of wood. When figuring for dynamic compression, use the static compression figure, plus any other variables (like the intake valve closing event) the calculator calls for.