Anyone ported the Au BBM?

[FS5]

Originally Posted by Stav

I did a spare head in the garage.I never full removed the bbm. I didnt know the butterflies dont open fully. I am looking at dumping the manifold for something a bit different.Well alot different lol..

Intake ports matched by gasket to manifold then gasket to head.

i had a play with a bbm but never got round to fitting it.the butterflies don't open all the way up ,they stay on a bit of a lean when fuly open .how much of a topend restriction this is i wouldn't know,but i don't reckon it would be much.
you can get them to open all the way up by simple bending the little metal stopper thing on the front of the bbm where the vacume hose fits it.i'd recomend pulling the top of the bbm off to get it right ,or you could go to far and end up closing them slightly the other way.