Top End Gasket Kit for Arctic Cat Pantera (1985-1989)

Gasket Material Composition High-temperature aramid fiber reinforced composite with nitrile rubber binder, engineered for powersports engine sealing applications Included Sealing Components Cylinder head gaskets, cylinder base gaskets, exhaust manifold gaskets, intake port gaskets, coolant passage O-rings, spark plug well seals Compatible Engine Displacement 497cc (500 class) liquid-cooled two-stroke twin cylinder, standard factory equipment on 1985-1989 Pantera models Operating Temperature Rating -40°F to 450°F, formulated to withstand sustained high-RPM operation in cold winter riding conditions OEM Cross-Reference Numbers Direct replacement for Arctic Cat factory part numbers 0636-307, 0636-159, 0636-221 Compression Seal Performance Maintains a leak-free seal at cylinder pressures up to 180 PSI, suitable for stock and mild performance-modified engines Cylinder Bore Fitment Precision die-cut to match stock 72mm cylinder bore diameter, with 0.5mm overbore compatibility for standard top-end rebuilds Installation Torque Specification Cylinder head fasteners should be torqued to 22 ft-lbs in a factory-recommended crisscross sequence, no additional sealant required for most mating surfaces Chemical Resistance Rating Resistant to degradation from ethylene glycol coolant, two-stroke pre-mix oil, 91+ octane pump fuel, and exhaust gas deposits Fit Type Application-specific direct-fit design, no cutting, trimming, or custom modification required for proper installation Gasket Thickness 0.8mm compressed thickness for stock cylinder deck height and factory compression ratio retention Seal Lifespan Rating Engineered for 3000+ miles of reliable service under normal recreational riding and maintenance conditions