It's square-ish. I could have sworn there was a windshield washer nozzle in the this morning. What now?

Those things should be replaceable maybe at a part store...

At least a spark plug didnt make the hole!!

Sure beats what a buddie did... a motor failed in his old Chris Craft... The only thing that stopped the connecting rods from going through the bottom of the boat was the cast oil pan which was totally destroyed. Lap strake planking not much for containing explosions.I was with somebody & didn't want to freak out with witnesses. You know, now that I think about it, I DID see something fly by my driver's side rear view mirror on the highway... OK I was speeding... I had no idea what it was. Mystery solved. I'll lift the hood in the daylight tomorrow.