1997 Ski-Doo Factory Shop Manual Volume One, Page 73Get this manual
Section 03 ENGINE Sub-Section 03 (377, 443 AND 503 ENGINE TYPES)
At cylinder no4 andor cylinder head no3 installation, use aligning tool or exhaust manifold itself to ensure sealing of intake manifold and exhaust before tightening cylinder head nutsENGINE TYPE ALIGNING TOOL PN 420 8761 71
377, 443 and 503
A01C02A
1Piston notch 2Circlip break at o'clock
420 8761 71