Do not purchase these pistons and connecting rods, they do not fit properly. After receiving their product and installing 2 pistons and rods i discovered the rods are striking the bottom of the cylinders, can hardly turn the crankshaft 90 degrees past TDC. I tried in vane to return the rods to Wossner and they refused warranty stating on the install instructions there may be additional machining required, not must, may, which is a total cover your azz document. Do not buy their product or you will be stuck "knotching" the bottom of your cylinders, which in my opinion is totally a hack way of installing something. They do not even give you the dimensions of how big a "knotch" you are going to have to remove, what a joke, just like their company moto Wossner "research and devolvement" laughable. I would have never purchased their product knowing I would have to grind or machine a "knotch" in the bottom of my cylinders, trying to give everyone else the heads up to not buy their product when there are other alternatives that bolt rite in. Supertech and ZRP are know to fit without issues