no, the wrist pin is centered. there is a notch in the top of the piston, but all 8 of them are exactly the same; if i put the notch forward on both sides then the driver side would have the reliefs tward the manifold, and the passenger side twards the exhaust. i got a pic of the first one i put back in, maybe it can help. its on the driverside. http://i831.photobucket.com/albums/zz233/Toste_bucket/66%20chevy%20C-30/0615101820.jpg


66' Chevy C-30 Rat