Thread: Old vs new heads

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Sorry, I was off base with my reply talking about chamber volume. Probably depends on how you plan to use the engine as much as anything else, right? Is it going to be mostly in the mid-range with an occasional run up to high rpm, or will it have significant time pushing the limits? How important is a friendly idle range for you?

Originally Posted by rspears

Sorry, I was off base with my reply talking about chamber volume.

You may have been closer to correct than you think. A smaller intake port runner will speed up the mixture and help to pack the cylinders better, resulting in a higher cylinder pressure, the same result you might get with a smaller chamber.

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Thank you. I am having a hard time deciding. I don't want to be winding this thing out all the time. If I take it from 525 hp down to 510 hp that's not going to kill me but I want a good pull and snappy throttle response