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It can be both. Take for instance the LS7 which is a 427 small block. Previous 427 engines used by GM were mostly big blocks. The 350 refers to the size of the cylinders. In a big block they are spaced farther apart then compared to a small block, thus a small block is usually lighter and shorter.
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John says:
so i had to dump acid into the block tank today
i'm afraid to fap
cause i got it on my hands
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