flow figs

1Wild,
In technical terms, the higher the test pressure the more fine the details of any changes are seen. You have to rememebr tho... there is NO real dynamic test procedure for a head port. None. Nothing. Anywhere. As I said before... the tester can wangle numbers up or down to get what they need. All kinds of ways. I dont feel it's that much of a big deal testing at 10" vs 25" vs 28". But a tiny change that 28" may see in terms of resulting data a 10" bench may not. However, at least 80% of the porters can use a 10" bench and deisng and execute a very good port. I have two friends with the SF110 benches in their garages. Both test at 10" and convert. The few times they have had the heads flowed elsewhere at 28" as a check... they are within a couple cfm of the conversion. That's well within the repeatablility of one bench, never mind two different benches and operators.