Press Fit vs. Full Floating Wrist Pins

It's been argued back and forth for decades. The general idea was in high performance engines, the full floating pin allowed a little acceptable movement of the piston in the bore and relieved stress.

Both are acceptable. If you go full floating have the rods BUSHED. Some people do not and simply have the little end of the rod honed until the pins float in the rod. Although people have done it and gotten by, you need two different metals there. What the pin slides into must be softer than the pin itself or the rod and pin will gall and seize. Lastly, bushed rods need a hole drilled straight through the top of the small end and into the pin bore for splash lubrication of the wrist pins. That's about it.