In distress... help?

Does anyone have a listing of engine bearings by bore size? I have an early Hemi (331) that Ive done a lot of work to, only to now find that the main bearing bores were made oversized at some point before me getting it. I built main caps for it. Made the bores of them undersized for fitment. I was just at the machine shop and they wanted to know what finished bore size I wanted... because the block had already been line bored over standard size.
The bore spec is supposed to be 2.6565”- 2.657”
The bore is now approximately 2.688” (best i could measure without the actual original caps)
All bearing bores look good and measure about the same, they are just incorrect for this block.
I assume the block was damaged at some point and someone adapted some other bearing into this block.
Crank journal is at -.010 (2.500 journal)
Any ideas/ solutions???

With a 2.500 bore I wouldnt think thats too hard to find.. just guessing

I just checked my A8 sprint car block. Looks like someone may have just made the hemi block accept 340 main bearings. Actually happy now instead of worrying.

Glad to see that your happier now,, I forgot that I had just checked my 340 block for bearings

long time ago I did a 354 hemi, and I forgot his name but a guy had all kinds of LA engine parts that would fit the Hemi. I think I used a LA oil pump with an adapter, 340 six pack flywheel, I think the timing chain interchanged as well. So that modification may have been done as well, on your bearings.

There are a lot of 331-354s running around with 340 mains and pontiac rod bearings. Think the mains was just a rebore, rods had to be bored .005 or so, and have the tang slots moved. Been 30 years since I did one, bearings were hard to find then.

Good to know. Unfortunately, I was able to find bearings for a stock bore, 010 under crank for a 331. Fairly spendy$$$.
Now I have to seek out a set of 340 bearings, which I would imagine are easier to find, cheaper, and have a wider selection of options.
All around though, Im glad it is what it is.

Call Ron Farley racing engines. 716-799-5588.

He specializes in early Hemis

We use many of them as counter weights around the shop.