This assembled GX340 cylinder head kit fits Honda GX340 GX390 GX390T GX340T GX390UT2 GX340UT2 11 horsepower 13 horses power 15 horse power 337cm3 338cm3 340cm3 389cm3 390cm3 engine and power equipment with GX 340 GX 390 11 horsepower 13 horses power engine. It contains all parts you need, including Honda GX390 GX340 cylinder head,valve cover, valves,valve spring,spark plug,insulator, head gasket, valve cover gasket, carburetor gasket set, muffler gasket, all bolts and nuts and others as picture.It is a complete Honda GX390 GX340 cylinder head assembly.