hi 76gmc1500: Rod end play is .010 (book is .011). Crank end play is .003 (book is .004). I'm obviously .001 under on each, but that doesn't seem to bug anyone I've asked. (they say usually one has the opposite problem of too much clearance). Another thing that has come up to some is a high volume oil pump. Ours is "suppose" to be stock pressure and volume. (pressure is almost 40 at about 1700-2000 rpms. Ring clearance is .002. Pistion to wall is .0025. Ring gap top-.020, second-.022, oil .030. (283 bored .040 over). Oil clearance-mains .002 rods .002.