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Chevy does not cast the block size onto the block. once you see a big block compared small block you will know the difference. at a glance with nothing to compare it to id say look at the head. small block heads have one exhaust port close the ends and two exhaust ports real close together in the middle. the big blocks exhaust ports are evenly spaced and not close together at all.

If it is a 350 or smaller it is a small block. If it is a 396 or larger it is a big block except for the 400 which was made in both small block and big block configuration.

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Q: Where do you find out what size engine you have on the block it is a Chevy don't know if it is a smaLL Or big block?
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