5:1 Valvetrain: OHV – 2 Valves per Cylinder Horsepower: 105hp (4BT) – 170hp (4BTA) Torque: 265lb-ft (4BT) – 420lb-ft (4BTA) Farmall M and H with add on live hydraulic pump were well known for breaking cam gears. The original pulley on the M had two timing marks close together. Lobes dont appear to be worn and are consistent with the others within. Thanks again for the info Sonny! Seemed like a great guy and willing to help anyone out. Have found an early reference to a lift of 0. All parts are Hypermax designed and built. Data plate on the left side of the engine area. Alongside Farmall H and its versions, Farmall M tractor was the smaller one … Farmall M Production. 625 Bore Cylinder set for John Deere, 12:1 Compression Ratio with solid wrist pins and billet pistons. He does lots of auto/truck/specialty cams.
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