12729604 LS3 Block, Replaces 12673475

Direct replacement for: 2009–2012 L9H, 2010–2012 L94, 2008–2013 LS3, 2010–2013 L99, 2007–2008 L92; Production aluminum

block with iron sleeves; Production oiling system; Forged powdered metal 6-bolt main bearing caps; 9.240" deck height; Use only
LS1, LS6, LS2, L92/LS3-style cylinder heads:4.065" finished bore (103.25mm) Provisions for Active Fuel Management. Great for stroker cranks for even more cubes. Tested to over 500 horsepower!