And I have checked out the block as good as I could with the oil pan off. Only damage I saw was a small chip broken away by the small intermidiate shaft bushing. I shut car off immediatly after hearing the sound. Not sure how the combustion chamber looks, to know if the piston would hit the spark plug or not, but no damage to spark plug. It broke the rod cap off, so not like there was a piece of the rod still attached to crank flinging around inside the block.