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Thread: Numbers on LS1 or LS6 Block

  1. #1
    Join Date
    Apr 2003
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    I have been scanning ebay for engines getting ideas, and was wondering what the numbers are that tell if the block is an LS6 block. I had seen some post on this before but can't locate them now. Thanks for the help.

    Randy
    RChevy.48
    2001 Silverado RCSB 4.8L
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  2. #2
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    Apr 2003
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    Mansfield, Texas, USA
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    Originally posted by RChevy.48@Nov 22 2003, 03:55 PM
    I have been scanning ebay for engines getting ideas, and was wondering what the numbers are that tell if the block is an LS6 block. I had seen some post on this before but can't locate them now. Thanks for the help.

    Randy
    I think around mid '01 GM put LS6 blocks in all the F-bods and C5's. I am pretty confident all '02+ have them.
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  3. #3
    Join Date
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    Allen, Tx(DFW)
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    12561168 is the casting number for an LS6 block.
    02 Silverado
    02 TrailBlazer

  4. #4
    Join Date
    Mar 2003
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    I knew I had seen this before! hahaha! http://forum.ls1truck.com/index.php?showto...st=0&#entry1858
    2006 Superior Blue Trailblazer SS AWD, Stock as a rock

    Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).

    Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning

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