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How you think the 9s compare to the 8s that you have worked on? just asking because there is always a talk about which will make more power and w9 cant make big power.


So far I think W9s have not been given fare shake I think they will make good power but most of the W9 stuff was for dirt track ports and chamber all wrong.
I did not like the W9 for same reason but now that I have worked with them they are nice, Intake port has more meat in it than early W8s.
Draw back is the valve are .100" closer to exhaust side of head.(this will hurt small bore more and small bore with big lift .750"plus will be at disadvantage)
I think if you are doing W9 engine you should run 4.150 bore or bigger then valve placement would be a wash.
The other thing I am updating 3 sets of W8s right now and they are all a PITA start with new W9s and dont look back.
I think my W9 in max effort NA deal can do 850~900HP to be seen but the data on the head backs this up now just need some one to step up and build one.