1999 Ski-Doo Factory Shop Manual Volume Two, Page 117Get this manual
Subsection 03
Section 04 ENGINE (494, 583 AND 670 ENGINE TYPES)
Position O-rings over cylinders then install cylinder head with its temperature sensor hole on rotary valve sideInstall and torque screws to 29 Nm (21 lbfft) as per following illustrated sequenceMake sure to install O-rings around spark plug holes1
A00A1FA
A0.43 mm (.017 in) feeler gauge
2Apply Loctite 242 to screw threadsProperly torque cylinders screws3Lay down cylinder head and insert aligning pins in holes as shownNOTE: If pins can not be inserted in cylinder head holes, enlarge them with 8.75 mm (1132 in) drill bit4Install screws in center holesTorque to 10 Nm (89 lbfin)2