2007 Arctic Cat Four-Stroke Factory Service Manual, Page 102Get this manual
31Install the alignment pins into the top of the engine; then install the new head gasket ! CAUTION
Make sure that there are no restrictions in the oilport hole of the head gasket or severe engine damage may occur
34With light film of engine-assembly grease applied to the tappets, install the correct shim (A) and tappet (B) to each valve of the cylinder head as noted during disassembling
! NOTE: Prior to installing the camshaft, it is advisable to apply engine-assembly grease to the camshaft journals and lobes