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using the Mid-Lift technique for rocker arm geometry.
most rocker arms have you just have the roller tip center in the valvetip to acquire geometry.
the MidLift technique has you measure the pushrod length when you are at 50% cam lift. when at 50% lift you want the top of the rocker arm to be 90* from the rocker arm stud. the purpose of this is to make sure the sweep of the rocker arm is consistent and to spec and even loaded.
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