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Southern Performance Systems, Inc Postal Address: 6050 Peachtree Parkway Warehouse Visits by Appointment Only |
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This page list some of the Casting Numbers for LS Series Engine Blocks and Heads. This is only a short list but we plan on continuing to expand on the list over time.
The Casting Number for a LS Series Block is located on the rear of the block just below the drive side head. (See Image) However, occasionally the cast number may be located on the Passenger Side. The last 3 or 4 digits of a head's casting number are located on the lower-right side of the head. (See Image)
Block Casting Number |
Engine Model |
Year Range |
12550592 |
LS1 (5.7L/346ci) |
1997 |
12559846 |
LS1 (5.7L/346ci) |
1998 |
12559090 |
LS1 (5.7L/346ci) |
1998 |
12562174 |
LS1 (5.7L/346ci) |
1998 |
12559846 |
LS1 (5.7L/346ci) |
1998 |
12560621 |
LS1 (5.7L/346ci) |
1998 |
1240030 |
LS1 C5R (5.7L/346ci) |
C5R Racing Block |
12559378 |
LS1 (5.7L/346ci) |
1999-2000 |
12561168 |
LS1/LS6 (5.7L/346ci) |
2001 |
12561166 |
LS1/LS6 (5.7L/346ci) |
2001-2004 |
12568952 |
LS2 (6.0L/364ci) |
2005 |
12560799 |
LS2 (6.0L/364ci) |
2006-2007 |
12584724 |
LS3 (6.2L/376ci) |
2008-Present |
12598723 |
LS7 (7.0L/427ci) |
2006-Present |
12621766 |
LS9 (6.2L/376ci) |
2009-Present |
12569513 |
5.3L Aluminum |
2005* |
12551358 |
4.8L/5.3L Cast Iron |
1999-2003* |
12551364 |
6.0L Cast Iron |
1999-2004 |
*Year Range Listed is for Known Years only. |
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Block Casting Number |
Engine Model |
Year Range |
10212339 |
LS1 (5.7L/346ci) |
1997-1998 |
12558805 |
LS1 (5.7L/346ci) |
1997-1998 |
12559852 |
LS1 (5.7L/346ci) |
1999-2001 |
12564241 |
LS1 (5.7L/346ci) |
2001-2004 |
12564243 |
LS6 (5.7L/346ci) |
2001-2005 |
12564243 |
LS2 (6.0L/364ci) |
2005-2007 |
12600821 |
LS3 (6.2L/376ci) |
2008-Present |
12578452 |
LS7 (7.0L/427ci) |
2006-Present |
12621771 |
LS9 (6.2L/376ci) |
2009-Present |
12559862 |
LS1/LS6 (5.7L/346ci) |
1999-2003* |
12561706 |
4.8L/5.3L Cast Iron |
2004* |
12562317 |
4.8L/5.3L Cast Iron |
2001-2006* |
12572317 |
6.0L Cast Iron |
2001-2006* |
12572035 |
6.0L Cast Iron |
2001-2006* |
*Year Range Listed is for Known Years only. |
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