My Father's Oldsmobile

[500/600]

Noises? Any warning at all?

 

[fleming442]

Yeah, 1 rod started "you keep on knocking, but you can't...." Done

 

[DRIVEN]

Time for a 425 upgrade.

 

[olds307 and 403]

Time for a 425 upgrade.

Yeah, 350 SBO with the billet 4" crank. He already has a 425 crank, offset ground, pretty sure. This sucks *ss, my day doesn't seem so bad now, sorry this happened. Hopefully the damage is minimal.

 

[64nailhead]

Hopefully the damage is minimal.

x2 with this ^^ 🙁

 

[Turbo Zach]

🤯

 

[81cutlass]

Do olds engines eat rods easily? Seems like this isn't the first one I've seen built well that ate a rod.

 

[olds307 and 403]

The BBO is finicky in the bottom end and has enough power to hurt itself. Big journals, factory rods are soft, crank is heavy and the block webs aren't very thick. Pretty much all the stock ones with tight factory clearances are revved up too high and they start knocking. The 76 and older Olds 350 has almost no issues, smaller journals and an available 4" crank that is much lighter than any BBO crank. That gives around 425 ci with a reasonable overbore.

 

[Northernregal]

Do you have a plan of attack coming together? Or pull and see what's up before you get a direction?

 

[Pc3]

Yeah, 1 rod started "you keep on knocking, but you can't...." Done

its not like you where totally surprised. somewhere deep down inside worst case senerio you imagined it....
so sorry for your loss.
OEM block good?