Pulled the heads,found no shrapnel. My theory was if an intake was open the pressure could have sent a piece down the hole. As long as the steering linkage and diaper were off I pulled the pan and checked the rod bearings. I'll put the heads back on tomorrow. Has anyone back fired one of these after the blow off valve install? I can see why it popped the top. Only had 3 threads of engagement of the lid bolts. Total carnage. Melted 2 temp sensor wires,1 vacuum line, 1 accelerator pump(there plastic on Eddelbrocks,throttle cable, fill the fire bottle, distributor rotor (Intake knocked the distributor cap off), very lucky.