This is our Watcon 701 Big Bore 84mm-85mm Head gasket. This is an OE Fiber type gasket, with 85mm rings, to be used with a stock head on a larger 84mm bore. Commonly used on SJ Lites Class Skis. (760 pistons in a 701 cyl, with stock 701 head / exhaust). We STRONGLY recommend recutting head domes, for larger bore when building an engine like this. We offer this service here. Please email with questions before ordering.