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Toki used a set of TD Machine Products shaft rockers, but you can use a standard stud system if needed. Note the 0.050-inch offset on the intake side. The intake valve is moved toward the center of the chamber to unshroud it and get the last bit of airflow. The exhaust valve is moved toward the chamber wall. The 1.269-diameter valvesprings have 155 pounds on the seat, a 42-pound rate, and can handle up to 0.650 lift.