It could not be a bolt-in due to the way the water chamber is.
At least not from the cut up photos i have seen on these heads.
I have been trying to get my hands on a BAD head for a few yrs
now. Because so many guys have asked me if this could be done.
And from what i have seen those ports are small to start with,
an if they can not be opened up some adding a lump to those
ports may do more harm then good.Unless they could be made very short and Close to the short turn raduis.
But bottom line is If the ports can be opened up before hand i seen no reason why the lump wouldn't help that head.

Larry/Twisted6
[oooooo] smile
Adding CFM adds boost smile
shocked God doesn't like ugly.