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                                                    LS1/LS6/Gen III  Engine Components

Engine Component Details

Engine Application Guide 

Gen III Cylinder Head ID Numbers

Gen III Intake manifold ID Numbers

 LS1 LS6 Fuel Injector ID's

Camshaft Identification       LS1      LS6          Truck 4.8L  5.3L          6.0L 

PCM Identification  1997-2007

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Engine Component Details:

Engine Block Aluminum: Cast of 319-T5 spec aluminum- All 5.7L,  some 2003 5.3L, 2005 6.0L

Cast Iron: 4.8, 5.3 and 6.0L 

Cylinder Heads Aluminum: 356-T6 Semi-permanent mod (SPM) and sand cast  moldings

Cast Iron: Some 1999 and 2000 LR4 and LQ4 engines

Crankshaft Cast nodular iron, internally balanced, rolled fillet journals. Two piece integral reluctor ring on crank end (24x 1997-2003, 58X 2004 up).
Connecting Rods Powdered Metal (PM) forged, steel alloy.
Pistons  Hyper-eutectic cast aluminum, flat top, no valve relief's. Coated top and sides used on Corvette and 345 hp 6.0L (LQ9)
Piston Pins Steel,  24MM (.940"), pressed fit
Piston Rings First Ring: molybdenum filled 9254 steel 1.5mm (.059") thick  Second Ring: cast iron with tapered face with reverse twist   Third Ring: Oil Control, expander with support rail inserts              
Valves 1999 up LR4 (4.8L), LM4/LM7 5.3L    1.89" INT   1.55" EXH        

1997 up LS1/LS6, '99-'00 LQ4 (6.0L), '01 up LQ4,/LQ9 (6.0L) 2.00" INT  1.55" EXH

Valve Springs 4.6mm chromium silicate oval shape wire in "beehive" design
Valve Spring Retainers Steel
Valve Spring Retainer Locks Steel, 10 degree design
Camshaft 5150 steel billet, gun-drilled 17mm hole
Lifters Hydraulic roller
Rockers Investment cast steel, needle roller bearing design, pivot mounted to investment cast aluminum rocker cradles
Pushrods Steel,  8mm (.0320") dia., .075" wall thickness
Cylinder head gaskets Graphite layers over a steel core.
Ignition system Coil near plug design, one coil per cylinder, PCM controlled through inputs from cam and crank sensor timing. 
Exhaust Manifolds 1997-98 LS1- dual wall welded, 1999 up, cast iron design
Fuel Injection Sequential, port fuel injection
Water Pump Aluminum housing, conventional flow (not reversed), integral thermostat
Oil Pump  Gerotor design, driven off front of crankshaft 
Oil Pan Cast 356-T6 Aluminum, incorporated oil filter boss, baffled design

Engine Application Guide             (TOP)

                  RPO    ENGINE SIZE  LTR/CU. IN     BORE DIA.  IN/MM      STROKE   IN/MM            PLATFORM
                  LS1                   5.7/346               3.898/99               3.622/92 Corvette, Camaro, Firebird, GTO
                  LS6                   5.7/346               3.898/99               3.622/92 Corvette
                  LQ4                   6.0/377               4.00/101.6               3.622/92 GMC/Chevrolet Full Size Trucks
                  LQ9                   6.0/377               4.00/101.6               3.622/92 Cadillac Escalade, Silverado SS
                  LM4                   5.3/322               3.779/96               3.622/92 GMC/Chevrolet trucks
                  LM7                   5.3/322                3.779/96               3.622/92 Full size trucks 1999 and later
                  LR4                   4.8/293                3.779/96               3.267/83 Full size trucks 1999 and later

 

       Model Year              Engine        Casting Number (s)   Design changes/upgrades
             1997     LS1 5.7L (346" cid)            12550592  First Year of Production 
             1998    LS1  5.7L (346" cid)            12550592

           12559846

           12559090

Improved liner design, mid-year revision with new cam bushing material
             1998   LQ4 6.0L (377" cid)            12551364  Iron block with 4.000" bore
             1998   LM7 5.3L (322" cid) LR4 4.8L (291" cid)            12551358  Iron block with 96mm bore, can be bored to 99 mm to create a low cost LS1/LS6 engine
             1999     LS1  5.7L (346" cid)     12550592,  12559846

 

            No changes
             1999    LQ4 6.0L (377" cid)               12551364    Iron block with 4.000" bore
             1999 LM7 5.3L (322" cid) LR4 4.8L (291" cid)               12551358 Iron block with 96mm bore, can be bored to 99 mm to create a low cost LS1/LS6 engine
             2000  LS1  5.7L (346" cid) 12559378, 12559846, 12560626 Cored rear cover oil passage, improved oil distribution and flow
             2000  LQ4 6.0L (377" cid)               12551364   Iron block with 4.000" bore
             2000 LM7 5.3L (322" cid) LR4 4.8L (291" cid)               12551358 Iron block with 96mm bore, can be bored to 99 mm to create a low cost LS1/LS6 engine
             2001 LS1/LS6   5.7L (346" cid)               12561168 First year of LS6. Bulkhead vent windows, improve windage, reduce internal pressure
             2001 LS1  5.7L (346" cid)               12559378              No Changes
             2001 LQ4/LQ9  6.0L (377 cid)               12551364  Iron block with 4.000" bore
             2001 LM7 5.3L (322" cid) LR4 4.8L (291" cid)               12551358 Iron block with 96mm bore, can be bored to 99 mm to create a low cost LS1/LS6 engine
             2002 LS1/LS6   5.7L (346" cid)               12561168             No Changes
             2002 LS1  5.7L (346" cid)               12559378             No Changes
             2002 LQ4/LQ9  6.0L (377 cid)        12551364, 12573581            Iron block with 4.000"bore      
             2002 LM7 5.3L (322" cid) LR4 4.8L (291" cid) 12551358, 12567392, 12567393 Iron block with 96mm bore, can be bored to 99 mm to create a low cost LS1/LS6 engine
             2003 LS1/LS6   5.7L (346" cid)              12561168  c/o design until 12/03, block converted to "all" short head bolts, step from cam bearing parent hole changed from .25mm to .50mm, no change to part no.
             2003 LQ4/LQ9  6.0L (377 cid)  12551364, 12573581, 12577184  Iron block with 4.000"bore
             2003 LM7 5.3L (322" cid) LR4 4.8L (291" cid) 12551358, 12567392, 12567393 Iron block with 96mm bore, can be bored to 99 mm to create a low cost LS1/LS6 engine
             2003 LM4 5.3L (322 cid) Aluminum block-12566910 96 mm bore, with a 99mm LS1 liner with smaller bore, which can be bored out to 350cid
             2004 LS1/LS6   5.7L (346" cid)              12561168                No change
             2004 LQ4/LQ9  6.0L (377 cid) 12551364, 12573581, 12577184 Iron block with 4.000"bore 
             2004 LM7 5.3L (322" cid) LR4 4.8L (291" cid) 12551358, 12567392, 12567393 Iron block with 96mm bore, can be bored to 99 mm to create a low cost LS1/LS6 engine
             2004 LM4 5.3L (322 cid) Aluminum block-12566910 96 mm bore, with a 99mm LS1 liner with smaller bore, which can be bored out to 350cid

Gen III Cylinder Head ID Numbers           (TOP)     Location of the cylinder head cast number and is the last three digits of the complete cast number

Cylinder Head Usage Casting Number (Bare)   Valve size (int/exh) in. Port Volume (int/exh) cc  Chamber Volume cc
LS1 1997-98 10215339, 12558806         2.00/1.55             200/70             66.7 
LS1 1999-2001          12559853         2.00/1.55             200/70             66.7 
LS1 2001-2004  12564241, 12559853         2.00/1.55             200/70             66.7
LS6 2001-2004           12564243         2.00/1.55             210/75             64.5
LR4, LM4, LM7, L59 1999-2000           12559862          1.89/1.55             200/70              61
LR4, LM4, LM7, L59 2001-2004  12561706, 12569862          1.89/1.55             200/70              61
LQ4 1999-2000          12561873          2.00/1.55             210/75              71
LQ4  2001          12562317          2.00/1.55             210/75              71
LQ4 2002-2004          12562317          2.00/1.55             210/75              71
LQ9 2002-2004          12562317          2.00/1.55             210/75              71

 Gen III Intake manifold ID Numbers            (TOP) Identification number is found between the #3 and #5 injectors

          Intake Manifold                  Year  Casting #, manifold only  Manifold Assembly #
     LS1 Camaro-Firebird              1998-2000            12560688              12561855
 LS1 Camaro-Firebird  (LS6 intake)              2001-2002            12561184              12568465
    LS1  Corvette              1997-2000            12556333              12561856
    LS6 Corvette              2001-2004            12561182              12561179
    LS1/LS6              2000 +             12573572                 N/A
    Truck 4.8, 5.3 and 6.0 L              1999-2001             25321788              170999289
    Truck 4.8, 5.3 and 6.0 L                   2002             12573944                 N/A
    Truck 4.8, 5.3 and 6.0 L                   2003-             12574009                 N/A

 LS1 LS6 Fuel Injector ID's  (TOP)      Identification number on the fuel injector

                   Year/Engine Type                 GM Part Number Flow rate   3bar (43.5 PSI) /  4bar (58 PSI)
                    1997-98 LS1                          12554271                      24.7/ 28.5
                    1999-2000 LS1                         12555894                      22.3/ 26.3
                  2000-03 LS1 and LS6                         12561462                      24.7/ 28.3
           2001-07 Vortec 4.8, 5.3 & 6.0                         25317628                      25.20 @ 58 PSI
           2000-07 Vortec 5.3L Flex  VIN "Z"                         25326903                       33.0 @ 50 PSI
     

Camshaft Identification            (TOP)     Cam ID stamped on the rear of the cam.

LS1

        Year      Platform    Part Number Valve Lift in/ex -in  Duration in/ex            LSA Timing on Cam CL
       1997        Corvette      12554710      .479/.472       199/207            117       113/121
       1998       Corvette      12554710      .479/.472       199/207            117       113/121
       1998       Corvette      12560964      .479/.472       199/207            117       113/121
       1998  Camaro-Firebird      12557812      .500/.500       198/209            119.5       117/122
       1998 Camaro-Firebird      12560965      .500/.500       198/209            119.5       117/122
       1999       Corvette      12560964       .479/.472       199/207            117       113/121
       1999  Camaro-Firebird      12560965       .500/.500       198/209            119.5       117/122
       2000       Corvette      12560968       .500/.500       198/209            115.5       112/119
       2000 Camaro-Firebird      12560965       .500/.500       198/209            119.5       117/122
       2001        Corvette      12561721       .479/.467       196/207            116       117/115
       2001 Camaro-Firebird      12561721       .479/.467        196/207            116       117/115
       2002      Corvette      12561721       .479/.467        196/207            116       117/115
       2002 Camaro-Firebird      12561721       .479/.467        196/207            116       117/115
       2003       Corvette      12561721       .479/.467       196/207            116       117/115
             
             
              
  2001-2003       Cadillac      12560965      .500/.500       198/209            119.5       117/122

LS6     (TOP)

        Year      Platform    Part Number Valve Lift in/ex -in  Duration in/ex            LSA Timing on Cam CL
      2001      Corvette      12560950    .525/.525       204/211             116      114/118
      2002      Corvette      12565308    .551/.555      204/218             117.5      115/120
      2003      Corvette      12565308    .551/.555      204/218             117.5      115/120
      2004
      2005
      2006
      2007
      2008

LR4 (4.8L)  and LM7 (5.3L)    (TOP)

        Year      Platform    Part Number Valve Lift in/ex -in  Duration in/ex            LSA Timing on Cam CL
        1999        Truck    12560966       .466/.457       191/190           115.5     118/113
        1999        Truck    12560967      .466/.457       191/190           114     116/112
        2000        Truck    12560967      .466/.457       191/190           114     116/112
        2001        Truck    12560967      .466/.457       191/190           114     116/112
        2002        Truck    12560967      .466/.457       191/190           114     116/112
        2003        Truck    12560967      .466/.457       191/190           114     116/112
        2004            
        2005            
        2006            
        2007            

LM4  (Aluminum Block 5.3L)    (TOP)

        Year      Platform    Part Number Valve Lift in/ex -in  Duration in/ex            LSA Timing on Cam CL
        2003    SSR Truck    12560967      .466/.457      191/190            114      116/112

LQ4  and LQ9 (6.0L)        (TOP)   

        Year      Platform    Part Number Valve Lift in/ex -in  Duration in/ex            LSA Timing on Cam CL
      1999 LQ4   Truck/SUV     12560967     .466/.457      191/190           114     116/112
      2000 LQ4   Truck/SUV     12560967     .466/.457      191/190           114     116/112
      2001 LQ4   Truck/SUV     12561721     .479/.467     196/207           116     117/115
 2002 LQ4-LQ9   Truck/SUV     12561721     .479/.467      196/207           116     117/115
 2003 LQ4-LQ9   Truck/SUV     12561721     .479/.467      196/207           116     117/115
      

 

PCM Identification       (TOP)        1997-98 style PCM     1999-2007 style PCM

     PCM ID #  OEM          Year(s) used       Engine and Platform No. of teeth crank reluctor
               16238212           1997-1998              LS1 5.7L                  24
            09254896           1999-2000          4.8, 5.3, 6.0L                  24
            09354896           1999-2000              LS1 5.7L                 24
            12200411           2001-2003       4.8, 5.3, 6.0L   LS1/LS6                  24
            12576106                2003           4.8, 5.3, 6.0L                  24
            12586242                2004              LS1/LS6                  24
            12586243                2004            4.8, 5.3, 6.0L                  24
            12598343                2004         6.0L   GTO & SSR                 24
            12589463           2005-2006            4.8, 5.3, 6.0L                  24
            12597191                2005        LS2 6.0L Corvette                 24
            12597883                2005  LS2 6L Corvette, GTO,SSR                 24
            12583560                2006            4.8, 5.3, 6.0L                 24
            12583561                2006            4.8, 5.3, 6.0L                 24
            12596679                2006             SSR 5.3L                  24
            12603892                2007              LS2/LS7                 58
            12597121                2007            4.8, 5.3, 6.0L                  58
       

This is just a partial list and does not reflect all the available PCM's, just the most popular ones.

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