1999 Ski-Doo Factory Shop Manual Volume One, Page 114Get this manual
Section 04 ENGINE Subsection 03 (377, 443 AND 503 ENGINE TYPES)
NOTE: The ring compressor will not fit on over size pistonsCheck flatness of intake sockets no6Refer to ENGINE DIMENSION MEASUREMENT 04-04 and look for checking surface flatnessAt 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
A02C2PA
ALIGNING TOOL PN 420 876 171
377, 443 and 503
TYPICAL
420 876 171