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It's based on displacement, yours is 305 cubic inch which is a small block, big blocks are usually up above 400 or so You're right, a 305 is a smallblock, but the difference between bigblocks (bb) and smallblocks (sb) is NOT entirely based on displacement. Although it would seem that increasing displacement at a certain point draws the line between a sb and a bb, this is not the case; i.e a gm 396 cui is a bb whereas the 400 cui is a sb. The reason for this is that the difference is based on the (physical) size of the block itself,-as the manufacturer in this case traditionally operates with two different sized v8 blocks, one was named smallblock, the other bigblock. So, in the end the difference here is something one has to look up in a manual and then remember for future reference.

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Q: How can you determine if a 1986 Chevrolet 305ci is a big block or small block?
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