Originally Posted by matty347
Hi, i purchased a set of AFD4V heads recently, and was wondering if anyone has had them independently flowed?
I know some cylinder head manufactures inflate flow numbers by simulating a larger bore 4.125 on the flow bench (Not sure if AFD do this?), but most of us run 4.030 bore.
I have got the independent results, and I must say that i'm not happy with the purchase.
generally a 4.125 bore on the bench will flow anywhere from 15 to 30 cfm more than on a 4.030 bore..it depends at what lift the valve is at..how the bowl to chamber transition is..and the angle of the cuts..it depends on quite a few things,but in general it will be between 15 and 30 cfm at 28''...
so many variables,in how say,"300" cfm performs though,there is waaay more to it than that..but i suppose what you are saying,is that they are not flowing,what they are advertised to flow? if that the case,there must be a reason for this..oh,by the way,are you talking about taking a finished head out of the box,complete with his valves and flowing them?