The Stage6 R/T crankshaft with 85mm connecting rod is meant specifically for use with cylinders that are designed for 85mm conrods (e.g. Malossi MHR Team, 2Fast, etc.), but you can also use it with other cylinders if you use the Stage6 5mm spacer kit. The spacer works like an additional base gasket and the original stud bolts are replaced by longer ones. The spacers are designed for Stage6 cylinders, but can of course also be used with many other cylinders. A great high-end item.