A local company is offering a port job of the top including 1 mm larger intake valves and are promising a substancial improvement in the air flow - 100%. Anybody with an opinion or experiance on how this would effect a 790 America engine? Would it improve low end or whatever? I´m running with Thunderpipes. I have been thinking of big bore kit or modified cams but since there seams to be indications that the flow through the top is far less than possible I thought this would be the first thing to do.
Hasse

Hasse TBA -02 Pre-Fire Cardinal Red, Wiseco 904, Thunderbike pipes, Freak