Its called CENTRIFICAL force----It will explode and you need a certified containment /adapter for it plus the drive shaft also------and front pullies/dampner.
This will not be an engine combo for the streets /roads and for competition you will need many things SPI certified yearly plus roll cage/chassis/seat/safty harness as well as driver suit/helmut/gloves

A 10-12k rpm engine has no place on the street/roads