Engine › GROM 170CC BIG BORE KIT W/4-VALVE CYLINDER HEAD GROM 170CC BIG BORE KIT W/4-VALVE CYLINDER HEAD $0.00 Koso ceramic coated big bore cylinder kit forged w/4-valve piston and gasketsKoso 4-valve cylinder head (complete with camshaft, rocker arms, intake manifold, and all other parts shown in the picture)Not legal for use in California on pollution controlled vehicles, race use only in California - waiver available Quantity: Purchase Added! Koso ceramic coated big bore cylinder kit forged w/4-valve piston and gasketsKoso 4-valve cylinder head (complete with camshaft, rocker arms, intake manifold, and all other parts shown in the picture)Not legal for use in California on pollution controlled vehicles, race use only in California - waiver available
