1970-1979 Ski-Doo Snowmobiles Service Manual, Page 159Get this manual
CHAPTER TEN
Table Engine 354 444 Pressure cap Coolant mixture ratio Thermostat opening temperature
COOLING SYSTEM SPECIFICATIONS Coolant Capacity U.SGal0.6 1.2 13 psi 60 anti-freeze, 40 water 110F (43C)