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GM Gen III V-8 Cylinder Head Comparison - Gen III Tech

Gen III Cylinder Head Casting, Machined and Final Part Numbers
RPO Size Part Numbers
Year Casting Machined Final Assembly
LS1
'97-'98 10215339 10215339 10215337
12558806 12558806 12558808
'99-'01 12559853 12559854 12559856
'01-'04 12564241 12559854 12559856
12559853 12564242
LS6
01-04 12564243 12560800 12560802
12569315
12564824
LQ9
'02-'04 12562317 12562318 12565363
LQ4
'99-'00 12581873 12561874 12561876
'01 12562317 12562318 12562320
'02-'04 12562317 12562318 12565363
12565364*
LM4, LM7
LR4, L59
'99-'01 12559862 12559863 12559865
'01-'04 12561706 12561708 12563678
12569862 12559863
*(this PN also good for RPO KL5; the natural gas engine)

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