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As said hardened push rods needed with slotted push rod holes in head. Take a 3 corner file to one of your push rods, if you can cut it its to soft and will wear quickly in your heads. Also agree the valves are the wrong ones. Push rods may be wrong too, as a shorter push rod will bring the rocker tip back some. Be careful running both slotted heads a rail rockers together, as double alinement puts things in a bind.