I didn't mean that it had anything do with the discrepancy in flow numbers, I just thought you might find it interesting since your working on those heads.
Look at bill’s numbers above and you will see exactly the same thing happened to his heads as happened to my heads at .500. My one port calmed down a little bit then maxed out at 290cfm. The other port sounded like a garbage disposal and could do nothing but nosedive. And the very first port I flowed was almost exactly like their advertised numbers maxing out at 301. I would like to see the numbers from above on the Seinze bench (309) backed up on his other bench. It’s a 5-8 minute fix to bring these numbers up to the 303 area but it’s a shame someone spends good money for a cnc head that has been machine ported and have to be FIXED. If it was just 5-10 cfm like my one port ok. But how many of the 8 are trashed.