2002 Ski-Doo Shop Manual Volume Three, Page 117Get this manual
Section 04 ENGINE Subsection 02 (377 AND 503 ENGINE TYPES)
Cross torque cylinder head nuts nos1 and to 22 Nm (16 lbfft); torque each cylinder head individuallyInstall armature plate, fan housing and then air deflectorInstall gasket on each side of the air deflectorTorque intake socket bolts to 22 Nm (16 lbfft)