I have one of Jim's 12port strokers and I am very pleased and have no trouble.I drag race and the port job is all around,but at the track I am running right with all the bigger name drag ported motors.I have tons of low end,and the motor has awesome power every were.SO I SAY JIM YOU ROCK!!
As for you guy's that are having problems,what kind of port job did you get from Jim?Maybe it's the wrong port work for the use of the engine.For an example... If you are Trail riding,Playing around or even Hill climbing a drag port may not be what you are looking for..Just let me say before someone say's I had so and so port my motor or I know a guy that had so and so port my motor with a drag port and I used it for what ever...Not every builder has the same deffinition for port work.Some would say my drag port can be used for Dune riding,Hill climbing,and of course drag racing.BUT others would say my Drag port is intended just for that drag racing.
I'm not trying to get into a pissing contest just giving some thought.