Anyone ported the Au BBM?

[Tray]

Originally Posted by Pekkerwood

There must be something in the butterflies angle as the BA has bigger butterflies but still runs the angle

Closed position is at 78* BA have 42mm butterflies, Pre BA 38mm. Runners are identical as for volume. air will travel the shortest path.. South! I've rigged up my machine to bore these manifolds out to 42mm (pm if interested).. Porting the runners will be pointless unless your running 180rwkw plus