Jack , thank you for what you have shown us. I would find it helpful if you were able to post a photo of the valve opening method you use when flow testing.
Hope you have a good day on the bench.
Hope you have a good day on the bench.
Link's not working for me Jack.Bobby telling me how smooth the D port is flowing.
https://photos.google.com/photo/AF1QipPMW93tyrKyLNhry6bKxshHQb4arPIidfYYp7Jq
Now here's Chris's head
Left port and right port down 1,12,18,18 CFM
The right port was down on flow, the port dimensions are with in spec but I overlooked a small hump at the inner bottom corner of the wall near the short turn, which I filed down, lowered the corners of the short turn just a hair more and slightly rolled them over plus worked the guide boss some more. Also worked the long side of the bowl leading up to the seat smoothing the transition by straightening it out a hair more These small imperfections can upset flow by slowing it down and it doesn't take much to speed air flow back up. Will be going back down to Dallas next Saturday to re-flow the head, hopefully it'll be a positive test.Unfortunately I have extremely little time this week, a lot to do at work and with the family... Dear Jack, what a bummer the ride was so turbulent. I am glad that the head has come out so good!
Can you please explain what you mean with:
Is the handwritten chart you postet above of your first ported head and taken with the same flow bench? And was it also an DPort?
I can´t see a file in your link. If you like you can send me the video via https://wetransfer.com/, I will put it here!
Aller beste Grüße and a big thx!