1972-1981 Polaris Snowmobiles Master Repair Manual, Page 343Get this manual
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ENGINES
Torque the 8mm nuts to 16-17 ftlbsThe 10mm nuts are torqued to 26-29 ftlbsHetorque the 8mm nutsInstall the thermostat
Install the engine mount plate, torquing bolts to 55 60