Back in 92 I swapped race cars with a fellow (now considered friend) on a Sunday evening. The following Saturday I started it up (only 3rd time sense Sunday) drove it into the shop to fix the brake lights a things for street use. Pulled it back out of the shop & let it idle a bit with open fender well headers. Began revving it few times to about 2500 on the tach then it just stopped dead on a dime. I remember saying "that's not good"
I found the nut in the oil pan that I believe cause this. It had half of it's threads intact & the other half yanked out, leading me to assume that the nut was at the end of the bolt when the cap finally decided it couldn't take it any more. The nut was by itself with no bolt in it. It's puzzling though how it got that far without a failure first. But looking at the pic it appears to me that the nut was stripped off to the cap bent/broke the other bolt of about mid way. Wish I would've saved the nut.
I couldn't here the knock ahead of time, but my brother who was ~ 200' away said he thought he did just before it stopped on a dime.
When I got out to look, I felt to look under the car first, & there was the right rear freeze plug on the ground. I remember saying "that's not good either"
#8 rod had come off, pulled out of the piston & was all wadded up in where the cam used to be. The cam broke just behind #4 journal, 2 lobes then a break, 2 more lobes & a break. #5 cam journal was still in its block journal.
I got word later, it was thought that I was really high rev'n the motor, but I was not. I don't rev motors that are cold, new, or unknown yet.
FWIW: the next motor that went into this same car was also a "someone else built". But this one I went in a retorqued everything. Saw it had ARP bolt & forged pistons so I eventually stepped up to 300hp shot of nitrous & had no stock rod failures. But I did find where all the stock main caps (& bolts) had been doing the Watusi. I guess it was at its ragged edge.
Yeah that's a crack that runs the full length of the pin,...somethings gotta give somewhere. lol.