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Originally Posted by patrickt

Not true. The sound of a big block does not come from the size of the space in the cylinders, but rather it comes from the size and shape of the metal of the block. Just like a bell, it's not the size of the "hole" that makes up the underside of the bell, it's the size of the crown, waist, soundbow, etc that makes up the bell itself. I have never heard, or felt the sound, of a small block that was the same as a big block. Now, I firmly believe you can make a SB just as powerful as a BB, but you can never make it sound the same, anymore than you can make a small bell make the same sound as a big bell.

This being the case, the sound would be determined by whatever the "bell" is made of, be it iron or aluminum. I've not heard an aluminum BB next to an iron BB, but they should sound vastly different if the bell anology is correct.