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In distress... help? #2690082
08/21/19 04:22 PM
08/21/19 04:22 PM
Joined: Jan 2005
Posts: 1,897
Milwaukee WI
T
TRENDZ Offline OP
top fuel
TRENDZ  Offline OP
top fuel
T

Joined: Jan 2005
Posts: 1,897
Milwaukee WI
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???


"use it 'till it breaks, replace as needed"
Re: In distress... help? [Re: TRENDZ] #2690084
08/21/19 04:30 PM
08/21/19 04:30 PM
Joined: Jun 2003
Posts: 51,351
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 51,351
Romeo MI
With a 2.500 bore I wouldnt think thats too hard to find.. just guessing
wave

Re: In distress... help? [Re: MR_P_BODY] #2690121
08/21/19 07:09 PM
08/21/19 07:09 PM
Joined: Jan 2005
Posts: 1,897
Milwaukee WI
T
TRENDZ Offline OP
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TRENDZ  Offline OP
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T

Joined: Jan 2005
Posts: 1,897
Milwaukee WI
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.


"use it 'till it breaks, replace as needed"
Re: In distress... help? [Re: TRENDZ] #2690172
08/21/19 09:26 PM
08/21/19 09:26 PM
Joined: Jun 2003
Posts: 51,351
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 51,351
Romeo MI
Glad to see that your happier now,, I forgot that I had just checked my 340 block for bearings
wave

Re: In distress... help? [Re: TRENDZ] #2690267
08/22/19 08:39 AM
08/22/19 08:39 AM
Joined: Nov 2015
Posts: 318
Missouri
J
jwb123 Offline
enthusiast
jwb123  Offline
enthusiast
J

Joined: Nov 2015
Posts: 318
Missouri
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.

Re: In distress... help? [Re: jwb123] #2690353
08/22/19 12:44 PM
08/22/19 12:44 PM
Joined: Jan 2003
Posts: 1,297
Nebraska
4
4406bbl Offline
pro stock
4406bbl  Offline
pro stock
4

Joined: Jan 2003
Posts: 1,297
Nebraska
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.

Re: In distress... help? [Re: 4406bbl] #2690376
08/22/19 02:07 PM
08/22/19 02:07 PM
Joined: Jan 2005
Posts: 1,897
Milwaukee WI
T
TRENDZ Offline OP
top fuel
TRENDZ  Offline OP
top fuel
T

Joined: Jan 2005
Posts: 1,897
Milwaukee WI
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.


"use it 'till it breaks, replace as needed"
Re: In distress... help? [Re: TRENDZ] #2690381
08/22/19 02:52 PM
08/22/19 02:52 PM
Joined: May 2004
Posts: 10,806
Taxes R-US, NY
Dragula Offline
I Live Here
Dragula  Offline
I Live Here

Joined: May 2004
Posts: 10,806
Taxes R-US, NY
Call Ron Farley racing engines. 716-799-5588.

He specializes in early Hemis

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


'71 Duster Pump Gas 512LD 2013 Mod Gas Winner GRS
https://www.youtube.com/watch?v=DNMPXgRryws (6.08 at 112mph) (9.60 at +137mph)(+775hp)

'70 Cuda, Plan C....605 Hemi
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph)(823hp and still tuning)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

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