Athena Top End Gasket Kit - Polaris P400427600004

• Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason • Kit includes a top-of-the line MLSS head gasket and two or more premium quality base gaskets of different thicknesses to optimize engine compression ratios • Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression • Kit do not includes valve stem seals, rubber part, shims or other fiber gaskets. - Polaris Trail Boss 350 L 4x2 (1993, 1990, 1991, 1992); Polaris Trail Boss 350 L 4x4 (1990, 1993, 1991, 1992); Polaris Sportsman 350 4x4 (1993); Polaris Big Boss 350 L 6x6 (1991, 1992, 1993, 1990)