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Comp Cams FS HIGH ENERGY ROCKER ARM 2017-ford-f150-esi9044799 Can I use this asHigh EnergyT Steel Rocker Arm: Ford; 3 8", 1. 6 Ratio This COMP Cams High EnergyT Steel Stud Mount Rocker Arm designed for 1968 77 Ford V8 289 351W applications features a 3 8" stud diameter and 1. 6 ratio. High EnergyT Rockers help eliminate the noise and slop associated with older worn and high mileage stock rocker arms. With a long slot for higher than stock lift camshafts, these rocker arms are an excellent replacement choice for engine rebuilds