A higher thrust rated version of the CFM International CFM56-7, the 27,300lb (121.5kN)-thrust -7B27, is entering service on the higher gross weight Boeing 737-800s. The engine has been offered by Boeing since the completion of the -800 certification effort and provides a 1,000lb thrust boost over the previous highest thrust 737 engine, the -B26. It has been selected mainly by European charter carriers and will also be offered on the -900 and Boeing Business Jet versions.
Source: Flight International