I saw a 509 BB Chevy blow it's guts out on the dyo on it's first pull at the race shop. Guy had just paid a ton to a supposed "Chevy Guru". AFter the smoke cleared it was plain to see the he had left the rod bolts loose. Customer hauled it back to him and the guy convinced him we were lying to him. Told the guy he was making too much horsepower for the rods.

Glad you were able to save your customer some pain.