im going off memory here,, but i was surprised that when i "plugged" a port into one of these heads it went from like 250 to 270 or so,,, i thought that port should flow way more than that,, so i did a valve job,, which is a std deal anyways,, and dropped the depth down about .020-.025 and then it flowed a little over or around 300. the port recognized all the port work then,, cause an out of the box head with a good valve job only picks up 5 or so.
