2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 60Get this manual
ENGINE 2Thoroughly clean the cam shaft, making sure the oil feed holes are not obstructed3Measure height of each cam lobe using micrometerCompare to specifications4Measure camshaft journal outside diameter (O.D
CYLINDER HEAD REMOVAL
1Loosen each of the four cylinder head bolts evenly 18 turn each time in cross pattern until loose
Journal O.D
A Journal 2Remove bolts (A) and tap cylinder head lightly with plastic hammer until looseCAUTION: Tap only in reinforced areas or on thick parts of cylinder head casting to avoid damaging casting3Remove cylinder head and head gasket
Camshaft Journal O.D MagPTO End: 1.4935-1.4941I (37.935-37.950 mm)