Best answer I've seen on this subject is from this
thread, post #8
Quote:
Originally Posted by ChrisBlair
The L99 and LS3 are neither Wide Blocks nor Mark IV Blocks, so therefore, technically, it is not a 'Big Block'. There was an LS-3 back in the day but this is not the same as the one in your 5Gen
The LS series is not a development of the Small Block either, it's a new design, so when people say "is that a small block or a big block" the answer is "no". The LS series is a "Generation IV Block".
a good test: check fitment for small block Chevy parts in your LS3. How many fit?
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