The engines with cast iron pistons had a tendency to cluck a little, also. We used to install spring steel "expanders" between the wrist pin bosses and the piston skirt to reduce the clearance a little.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!