Dano’s Performance 2017-23 Suzuki GSXR 1000 Ported cylinder head, Heavy duty valve springs and Head Gasket. Dano’s Performance is offering this 2017-23 Suzuki GSXR 1000 ported cylinder head. This head has also been milled. 010 to increase compression and this package includes a head gasket and new valve stem seals. We also performed a three angle valve job for a perfect air tight seal and installed a set of Carpenter Racing heavy duty valve springs. This cylinder head is ready to bolt right on to your engine and go. Just bolting this cylinder head to your engine will add about 8-9 horsepower. This listing does not include cams.