This is a GM 3.780″ Cylinder Bore size GEN III LS Series 5.3L / 4.8L Bare Block.
* block casting # : 12551358
* Description : GM Standard bore size 4.8L / 5.3L LS Series LM7 / L59 / LR4 GEN III bare block w/ new cam bearings
* Specs – Material          : Iron                Displacement  : 5.3L / 325 c.i.d.                Bore Dia          : 3.780 in                Stroke              : 3.622 in                Deck Height    : 9.230-9.240 in                Main Cap        : 6-Bolt  

* information : block has been prepped (honed). Block is ready for assembly.             

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