What happened ?

Boom

Boom is right, engine didnt make it. I just purchased the rods and pistons and added them. Steve M in Florida sold them to me.

Did any cylinders need sleeves, are there any large chunks missing at the bottom of the cylinders?

Coast, I had the block from years ago, I purchased a new crank, 4340 then Steve sold me a set of Je pistons and eagle rods, one was damaged on the dyno, other had marks on it. So, the shop got 2 new rods, 2 new pistons , and bolts. Balanced the motor, and did the machine work to the block for clearance. So now its ready to go, Just need a buyer. all the hard work is done. for 3800.00, not 5k. U can tear it apart to check everything but the shop builds tons of motors, most 410 sprint. But I live in sprint/dirt car heaven, so I take all my boat and muscle car machine work there.

Thanks for that info. Usually when a rod lets go the block gets some damage, that's why I asked. Can you provide the piston part number, I haven't seen a dished piston that nets 9.5-1 compression with 119 cc chambers.