[Stan Weiss]

Originally Posted by steve25

Here’s a handy chart for street / strip motors up to about 470 cid .
This is not for race only motors trying to live on the street.

Note that a stock 67 and up D port head is 154 to 155 CCs

Steve,
Do you know what head that is based on? Port volume can be an indicator of average CSA, but only when the ports have the same port center line length. So a High Port would have a longer port center line length that a standard location port.

Stan