Willys 134L Four Cylinder Flat Head The engine displacement was 134.2 cu in (2,199 cc) with a 3.125 in (79.4 mm) bore and 4.375 in (111.1 mm) stroke, a very under square design. It was an L-head design, with valves parallel to the cylinders. Initial power output was 60 hp (45 kW; 61 PS) at 4000 rpm and 105 lb·ft (142 N·m) of torque at 2000 rpm with 6.48:1 compression. The L134 was phased out by the F-head or 134F beginning in 1952. There are two different styles of the 134L. The early engine in the jeeps is a chain timed motor (Approx. 1941-1946) The later 134L was a gear timed. See Pictures. To know if you have a chain timed or gear timed motor is normally pretty simple. The chain timed motor will have a short boss or flat plate molded into the casting just above the water pump (see picture of red engine) It will also have a large boss or flat casting on the passenger side of the motor just under where the oil filter is located. This is where the serial number is stamped. (also see red motor picture) The Gear timed motor will normally have a large boss or flat plate cast into the block just above the water pump this will have the serial number stamped into it. (see first black motor picture). Most of the time on the gear timed motors there will be a nickel size round boss under where the oil filter is located. (see second black motor picture) There is the rare occasion where there is a long boss under the oil filter on a gear timed motor, This is a military replacement engine or military aftermarket motor made post WWII.