usually it will have valve size and if ported who did it. I don’t hold it as gospel but it does give you an idea. And yes he did put a lot of work in that.
How you get on that list...
A couple, 4 members sent their numbers to him and they're on the list....but some numbers are complete bullshit..and now the sites credibility is not very good imo.
More ways to sell yourself is all that was used for.
As for those shocker flow numbers damn that sucks. Lot of things can affect flow numbers but as I am to understand those are out of the box so they should flow I would expect at least Within 5cfm if the manufacturer's bench given everything is calibrated.
Those numbers advertised I have gotten out of a iron j head...to see them on another bench be as low as 122 @.200 [email protected]
That's barely worked 2.02 conversion iron head stuff.
The same set of J heads that flowed the big numbers I mentioned.. I just had a valve job on...the max area of the valve type...and it knocked 10+ cfm off per .100. [email protected] now goes [email protected]@.400 is now [email protected]... [email protected] is now 264
There's reality that people CAN get a little more than others.. and it could be something simple & unrelated to your port work. If this helps anyone, great.