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The LS7's block and reciprocating assembly are compressed to accommodate the Corvette's fast hood line and taller cylinder heads, so the LS7's block is a little shorter than the 4.000-inch stroke would suggest. To compensate, each cylinder liner has small extension tabs to keep the pistons lined up the bores.
LS7 Unplugged

 The LS7's block and reciprocating assembly are compressed to accommodate the Corvette's fast hood line and taller cylinder heads, so the LS7's block is a little shorter than the 4.000-inch stroke would suggest. To compensate, each cylinder liner has small extension tabs to keep the pistons lined up the bores.  View Related Article