Item Part Description Quantity Variation Number 5158 1 GM88698 Cap Screw 18 2 GM49906 Bushing 2 3 GM49886 O-ring 5 4 GM46676 Sleeve 4 5 GM88798 Cylinder Head 1 6 223448 Cap 3 7 GM46683 Sleeve 4 8 GM18873 Pipe plug 1 9 GM49845 Spring 16 10 GM46678 Valve seat insert 4 11 GM88784 Valve Seat Insert 8 12 GM88799 Valve Kit (exhaust) (includes (2) seal) 4 13 GM46673 Cap 16 14 GM88786 Retainer 32 15 GM50041 Seal 16 16 GM49841 Valve Kit (intake) (includes (2) seal) 4 17 GM46677 Valve seat insert 4 18 GM88785 Valve Seat Insert 8 19 360531 Gasket, Cylinder Head 1 20 GM46675 Seal (not shown) 4