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-   -   1974 Mopar 360 machined with 340 core? (http://www.hotrodders.com/forum/1974-mopar-360-machined-340-core-166079.html)

ed22 10-03-2009 02:53 PM

1974 Mopar 360 machined with 340 core?
 
I have a 1974 360 block purchased from a guy who says that since this block was built in 1974, which is the year after the 340's demise, this 360 was in fact a 340 core machined to 4.00" bore. This would mean that the walls of the 360 would be thicker than the standard 360 block. This would be a very good thing since I plan to build a stroker that requires boring, but is this a fact or a myth? Are there some 360's out there that where built using the discontinued 340's core?

poncho62 10-03-2009 05:45 PM

My understanding is that a 360 is a stroked 340....same bore, just longer stroke. It would be the same block

poncho62 10-03-2009 05:48 PM

If you look here

http://www.allpar.com/mopar/318.html

a 360 has a 4" bore, whereas a 340 has a 4.04 bore, so if a 340 block was used it would gain about 7 or 8 cu in.......

ed22 10-03-2009 08:43 PM

Quote:

Originally Posted by poncho62
My understanding is that a 360 is a stroked 340....same bore, just longer stroke. It would be the same block

No, a 340 has a 4.04 '' bore and a 360 has a 4.00'' bore.

ed22 10-03-2009 08:52 PM

Quote:

Originally Posted by poncho62
If you look here

http://www.allpar.com/mopar/318.html

a 360 has a 4" bore, whereas a 340 has a 4.04 bore, so if a 340 block was used it would gain about 7 or 8 cu in.......

That is not my question though, the assumption is that instead of having a 4.04 " bore the 340 core was given a 4.00" bore making the walls 4 hundredths thicker on this 360. So I was asking if anyone has heard of this. A am asking this with no knowledge on how a block is manufactured, meaning, do they cast a block with a smaller bore then machine it to the required bore? (in this case the a 360 could be made from a 340 core as long as originally the block was produced with a bore smaller than 4") Again, this is just something I was told, and I am just treating it a myth.


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