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The reason for a seemingly complicated list of valvetrain parts is that everything needed to fit under the T&D shaft-mount 1.65:1 rocker arms. At these spring pressures and lift rates, the stock-stamped rocker arms would surely have folded under the pressure. T&D’s rocker arms don’t deflect, and they pivot on a pair of needle bearings. The rocker bodies are quite large, however, and some spring and retainer combinations will not fit under them.