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This is the exact replacement from Crane for the original Hi-Po camshaft. It's a good, old-fashioned solid-lifter camshaft that has to be broken in properly when the engine is first fired. Run at 2,500 rpm for 30 minutes, then shut it down and change the oil. The valve lash is .018 inch for both intake and exhaust in 1965-'66. For 1967, it's .019-inch intake and .021-inch exhaust.