T/A AAR motor

[cuda hunter]

https://seattle.craigslist.org/sno/pts/d/monroe-340-ta-mopar-engine-cuda/7311241776.html

340 TA MoPar engine Cuda Challenger Trans Am - $5,000 (Monroe)
© craigslist - Map data © OpenStreetMap
condition: excellent
make / manufacturer: Plymouth
model name / number: Cuda
TA engine block, crank, rods, and pistons from 1970 AAR Cuda. Block has been sonic tested and the crank has been Magna-fluxed and both check out good. Block is 60 over and crank is 20 over.
Block numbers are:
3577130.TA 340 7
Cast date:
11.24.1969
VIN stamp:
The block has been authenticated from TA/AAR registry as 0B306953)
Build stamping:
FW340 sP 3129 0431 (The sP designates TA engine build)
Build date:
Feb 20,1970
Rod casting:
2899496

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ce50e95a91f63ea4b24418ee5a0084e5@sale.craigslist.org

[cuda hunter]

jh23job306953

[Smallblock340]

Block is 60 over. How much overbore is safe for a TA engine block?
I guess this is an AAR block: BS23J0B306953

[Daveh]

60 over is the most I would ever go.  I think it would be fine. 

[tparker]

wow, I was going to say the same. I didn't think you could go .60 over, or at least that would be the limit. So this motor is kinda on it's last legs. LOL Well, maybe not.

[6bblgt]

0B306953 is/was an AAR

BS23J0B306953

just realized this was pretty close to the engine I sold last year from BS23J0B306946 are either of the AARs still alive? 

[70 Top Banana]

It is a high nickel block so if the bore at 60 over is good and does not need to be machined any further, I think that 60 over is ok. But at 60 over, once I had it in the car, I would not beat it to death.

[gzig5]

Any block should be sonic checked to go over .030" overbore.  Apparently it isn't unheard of for some early blocks to easily go .060 over, up to .100 over.  Not all, but some.  The TA block should be more likely to have a thicker cylinder wall than a standard block considering the extra effort put into these castings. 

[blown motor]

I have a standard block 340 bored 60 over. Rebuilt the engine nine years ago. It was 60 over then. Had to sleeve two cylinders. It has run strong and faithful ever since.

[Fastmark]

Not trying to stir something up but you guys need to actually do some more research about blocks before you start shooting out specs here as gospel.  340s are thin walled casting. All of them. Mopar recomends a max bore of .040 on any 340.  I've sonic tested a few of them. Including a TA block that was matching number to a friends car. It is no thicker than any other 340 block I've tested. They are subject to core shift just like any other block. This particular block was already at .030 and the sonic test results were scary. It only had a .090 thickness on the entire thrust side of one bank. It was not core shifted  that bad either. It was just thin to begin with. He was having it rebuilt by the local know it all Chevy guy and he was going to bore it to .060 against my recommendation. I sold my friend the car and finally convinced him to insist on a .040 max. The only other 340 I built for a racer that was at .060 when I received it for a freshen up, did not make it a month of racing before a pinhole developed and it had to be sleeved. No way would I buy a .060 TA block and expect it to survive.