no. 1 rod to come through the block behind the ac compressor
bad oil pump?
was running great up until this happened

Ever run it out or low on oil? Chances are a rod bearing took a shit. Crack it open and find out.

nah, was a great used block after i locked my old one
tops of the pistons was clean and the sump was also clean after we cleaned and no slackness between anything
oil was fresh in the engine and had correct amt.