Only a high lift/high velocity cam on the 2-53 and two valve heads. Now I just may know of a 2-53 with a four valve head crafted on and the high lift/high velocity cam. Equipped with the updated cam follower and valve springs. The springs don't bind but there is no flow advantage and over 2600rpm may float the valves. A waste of time and money vs the two valve head as is. If the cam had been reground then a different issue. If in a rpm limited class use the two valve heads and high lift/high velocity cam with the last spring update. Four valve engines first used a low lift/high velocity cam. Then the factory revised to a low lift/low velocity cam. If no rpm limit then regrind the 2-53 cam to low lift/low velocity and use either two or four valve heads. With lots of spring pressure above factory pressure. Try as one may, it's tough to beat a bored and stroked H.
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