JayBrake 6-piston differential bore)

made from 356-T6 aluminum

Includes 84-90/10-up style pressed wire gaskets

Note: A lower gear ratio number gives a lower RPM

S&S, 80"/1340cc cylinder & piston kit. Black 84-99 Evo Big Twin Signalhorn JayBrake 6-piston differential bore)Description Wrinkle black aluminum finish. Direct replacement for OEM components for a stock rebuild. Fits all stock 84 99 Evolution Big Twin models. For stock 4 1 4" stock stroke flywheels and stock 3 1 2" bore. Comes complete with stock length 5. 550" long cylinders, forged pistons, piston rings, wrist pins and head & base gaskets. Stock 8. 5: 1 compression ratio. Engine life can be expected to be excellent, like stock. Fitment 84 99 Evo Big Twin