I seem to remember cummins specs were up to about 0.006 or 0.007 on a stock engine (piston to wall clearance). I took my current engine to 0.008" p/w with ring gaps in the 0.030" area. Haven't had it apart in two seasons, but it runs great. EGT's have been up to 2000 plenty of times... I wouldn't go any smaller than this (once scaled down for your bore size obviously).
Do you have any more info on your build? I've been wanting to do a garden tractor puller as well...
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