My biggest gripe is its cost. $110 plus shipping. That's half the cost I charge to do a full port job. From the pic it looks like they also grind the edge to have the exhaust open sooner, and it also looks like the skirt is shorter. So you get a compression bump, longer exhaust and intake duration. Which is all good stuff, but what about the transfers? Does that mean the blow down is increased?
The 268 piston does all those things except raise the exhaust, and has a single ring. $35 piston and a few bucks to have someone machine it. But then on top of that the 268 piston is very light. Throttle response is great!
Maybe I need to start a thread about this to save future people some money.
Edit: so the crown does look higher which means the piston is ground on just one side to put the exhaust back to stock height. But again what about the transfers? Does blow down move from 23 to 26?
(I believe 23 is stock..)