1985-1995 Polaris Snowmobiles Master Repair Manual, Page 277Get this manual
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ENGINES Engine Specifications 1987 Models
CylHead CC's Uninstalled
26.5 21 .0 21.0 261 26.6 20.85
CylHead CC's Installed
23.7 17.2 17.2 24.5 24.0 22.05