Cool, cheers for setting me straight Gary, no idea where i got Dave from???

and Canada 1 cheers for the info i was infact reading a few of your old posts the other day!, i have a few pictures of theoretically perfect single ports some where i will dig out, the drawings infact had deliberate areas promoting high and low velocity, and a 'bottle neck' well placed and sized seemed to work incredibly well promoting the venturi effect..... however how relevant that is on a forced induction port i don't know.

I can see what you mean, but this thread is really about the comparison of modified heads with stock..... it would be really helpful to have flow figures etc but for the time being i will be basing good and bad on the NMS head (the bench mark), which would have been flow tested to death im sure, we can easily see from pictures which parts of the ports have been altered/enlarged/reshaped and so can probably base what is good and bad on whether its similar to the NMS head......

Have you got any more pictures of your head canada1? would be great to see, and also have you got any flow bench figures, especially flow bench figures which correspond to a change you have made like stock vs cut back valve guides etc.

Thanks very much!

Rob,