What is Quench

A couple years ago I built a 500 inch 440, it has BM aluminum rods ross flat top that came out of the deck .010 and closed chamber aluminum heads. All the parts cme out of a new build my friend bought, everything was set up wrong and the block was junk so we got a block rings bearings and .080 Cometic SS head gaskets, broke it in and he put it in a 67 notch, it ended up with 11.1 cr and runs on pump gas and it's a hand full on the street, last week he broke his custom 727 so waiting for him to pull it to see what happened.