[Gach]

When CV-1 where first introduced, it was established that they flowed 380 cfm out of the box. Which by all means out flowed a wide port head. Pontiac Dude was doing a pump gas builded. Long story short he ran a 10.20 maybe even 10.10.

I went with Wide Port. Both same size motor. Trust me we went back and forth on this. He hong up on me a few times..and I on him…LOL My second pass with wide ports I went 9.80. I had a set of CV-1’s. But went with wide ports. His thing was he kept saying these heads flow 380 cfm. My wide ports only flowed 362 cfm. But at 750 lift.

Finally when he got his CV-1’s to Gabby..Gabby calls me, he says yeah they flow 380 cfm, BUT! The air speed in the port is only 252… so to make up for low air speed he’s going to need a minimum of 275-285 duration. My cam is or was 265/276 hey it was a learning process for both of us, but I already new what air speed was. When Dude would shift that thing into second gear the rpms would drop almost 1000 rpms. Its like the motor wouldn’t recover.

Of crouse theres allot more to it then just air speed in the port.