I've got 1.84/1.54 valves with heads that are milled 0.020 and use KB116 pistons with a 2.6cc dome. With all that and a Crane 2031 cam (.513/.529), I had no problems at all. Rather than use the clay, I used a set of light springs in place of the Crane springs and was able to push on the retainer to get an idea as to the clearance. Can't recall the numbers, but the valves aren't even close!
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