brand new 525 crate with 20 laps. all break in procedure was done correct according to gm instruction that they give you. at 4000 rpm the engine went . 7and8 cylinders connecting rods broke. anybody else have problem. spent alot of money on engine and everything that goes with it. just under 15000. didnt get one heat race. forgot to say 2 nice holes in block. piece of garbage.