<div class='quotetop'>QUOTE(NITROUS &#064; Jan 24 2006, 08&#58;39 AM) [snapback]42050[/snapback]</div>
It is, It&#39;s just a cast iron block with a little more cubes.
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I thought an LS1 was specifically the all aluminum GenIII 5.7 liter motor that came in F-bodies and vettes and the 4.8,5.3, and 6.0 were just based on the LS1 design still being an LS motor just not an LS1.