Originally Posted by ammoman
Humm? Your not the first to port heads. If you only had 216 cfm to start you must have had a bad set of heads. Is it possible that some one just made a mistake with a few numbers. Any way 318 cfm is impressive if you realy started with only 216 and went to 318. However if you started with 270 ish cfm and went to 318 cfm for $1500.00 it's not impressive at all about $32/cfm.
What's the going rate machine shops charge for cfm gains these days? So if we maxed out the flow and ignored the velocity and say had a flow of 400cfm (hypothetical) then we can charge more? Even though we know it will provide diminished performance because of inefficeincy? You are one sly business man...