340 casting 2780930-2

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The block doesn't determine the compression ratio. The pistons and heads do. All 340s had the same casting number. The casting date will tell you a lot more about the engine. It's cast right on the side of the block.
 
front of the block below the drivers side head, should be some numbers/letters stamped in it.
or
pass side just above the pan rail, there is a machined boss with the last numbers of the vin. Get those.

Get those and it will tell what the engine came from or when it was built.
 
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