A nesting incident doesn't have to be that obvious! Back when I ran a dirt tracker in California, one of my competitors had the bad luck to scatter an engine one night. No sweat- - - -he's got all the bits & pieces of his backup engine under a tarp in the corner of his shop. He assembled the engine, installed it in his race car, and fired it up. About 5 minutes into the cam break-in runup, it burned a rod bearing. We found evidence of a mud wasp nest in the crankshaft oil gallery going to that bearing!

Conclusion- - - -never assume anything is clean until you make sure it's totally contamination-free!
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!