Just for information. I just broke a K1 rod in my 500 inch 8.71 engine. Big end of the rod was still attached to the crank, the section from about 2 inches up to the pin was lodged between the cam and the lifter galley, which broke two lifter bores out of the block.
Also took out 2 sleeves. One piston and pin were in the oil pan and I don't think there were any pieces bigger than a quarter left.
Car was on it's best pass to date and it let go about 550 ft into the run. The rods had been in the engine for 8 years so I think I found the limit. 1300 + HP.

My replacement engine until I get the block repaired will be my 572 with B1 heads, and 7.1 Oliver rods. Only complaint with the rods are the rod bolts are proprietary to Oliver. NOT Cheap. They are ARP and you can buy them through Summit and Jegs but they are Oliver design.
I'm thinking MGP when blower motor goes back.

Dave