There are two different four valve cams. The later is the low lift low velocity cam which stresses the valve train less. The ramp velocity is still slower on the early four valve cam than the two valve cam. You will have to set up a degree wheel and a dial indicator to see the difference. There are various codes stamped on the cam to identify which version it is. There is a chart in DD service manuals to figure which. A four valve 2-53 was never released from the factory but I know of at least one. Problem was it was built with the factory high lift-high velocity cam. Rpms above the normal 2400rpm limit for a 2-53 are not recomended. Now if you have the 2-53 cam ground to low lift-low velocity. And use valve and cam followers as heavy as or heavier than the latest factory spring updates. Then 3200-3600rpm is no problem,
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