I have Rockets, they work fine, I just wanted to try something different.
I know Rockets and PTR's work for sure, I have had both on mine. As far as porting goes, I guess it would be called a National MX port. MX port geared toward top end. Here are the specs to compare.
196* exhaust duration, 128* transfer duration, 130* boost port duration. Intake floors dropped 3mm.
These cylinders will be for sale if anyone is interested.