Quote:
Originally Posted by Joey Bohannon
Bert knows exactly what he is talking about! If they cc without the spacer plate there is a ton to gain. And if there wasn't gains to be had in port volume, then why do they make'm. Air speed can still be retained with more volume.
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It is measured without the spacer and not all engines use a spacer. There is a lot more to to volume to make power with cylinder heads.