Rick, I've read so many articles regarding rod/stroke ratio and concerns over the wrist pin in the oil groove issue. I had an industry expert who is also a good friend design and build my motor. There are several of the local Cobra guys running engines like mine and I've heard no complaints from any of them. Keith Black has figured out the ring issue. I've heard that though CHP has designed a piston with the wrist pin moved further up on the piston, the result is a weakened piston that is prone to failure. I want to believe that Scat and KB know what they're doing. I run my car pretty hard everytime I fire it up. She pulls like a rocket up through 6,500 RPMs.