ISLe Cummins Cylinder Head 4942138/5282720 Parts Catalog Ref No. Part Name Part No. Required 　 Cylinder Head PP99176-01 　 1 Fracture Resistant Screw 3960043 26 2 Cylinder Head Gasket 3967059 1 3 Threaded Plug 3977851 1 　 Cylinder Head 4942139 1 4 Valve Collet 3900250 48 5 Valve Spring Retainer 3944452 24 6 Valve Stem Seal 3948578 24 7 Exhaust …