Are all 340 blocks the same?

rmchrgr said

There are very few race blocks left, don't even think they are being made any more. I read on Moparts there are 4 left and they are not siamesed.

There really is no difference between a 340 and 360 block strength wise, they are the same. Not sure where you came up with that? Different bore and mains, that's it. Same block.

How much power are you planning on that you are thinking of exceeding the limits of a factory block?

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The 340 has smaller mains on the crank. This is an assumption but that means more meat in the mains in the block so doesn't that mean more strength in the block? Also slower bearing speeds in the bearings. I have read that the 340 block is stronger and can handle more power. Is that false? I'm planning on about 600 hp and I'm pretty sure that's right on the edge with a 360 block. I hate mechanical failures especially major ones that cost big bucks. My view is to always build things that can handle more power than you have.