nasty64

12589779 is on the back right side of the block. On the back left side of the block above the oil filter is etched T7R229356. On the block in front of the right cylinder head is cast 01F605 or 01F60S. I know its a gen 4 but could not find any info with these numbers. Was tild it came out of a 09 Tahoe. Thanks in advance.

1FastBrick

iTrader: (16)

Really? I typed it in to Google and came up with this.

LY2 4.8L from an 2007-2009 Chevrolet Van, Sierra, Silverado, Tahoe, Yukon

nasty64

I saw that to but I have flat dish pistons which tells me its a 5.3. So that's why I posted cause in confused...

1FastBrick

iTrader: (16)

Found this on Ebay.
http://www.ebay.com/itm/CHEVROLET-GM-GEN-IV-5-3-LY5-SHORT-BLOCK-STD-BORE-12589779-/331073802048?pt=Motors_Car_Truck_Parts_Accessories&hash=item4d15894f40&vxp=mtrStates its an LY5 5.3L

http://www.ebay.com/itm/CHEVROLET-GM-GEN-IV-4-8-LY2-SHORT-BLOCK-ENGINE-12589779-/321406924047?pt=Motors_Car_Truck_Parts_Accessories&hash=item4ad558750f&vxp=mtr
States its an LY2 4.8L

http://www.ebay.com/itm/CHEVROLET-GM-4-8-5-3-LY2-LH6-LY5-GEN-IV-STD-BORE-BARE-BLOCK-12589779-/331073804518?pt=Motors_Car_Truck_Parts_Accessories&hash=item4d158958e6&vxp=mtr
States the Block was used for the LY2 LY5 LH6