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LS9 Cylinder Head Gaskets Head Studs for 02-04 Chevrolet GMC 4.8 5.3 LS2 Engine Timing Covers 2004-2006 GMC YUKON XL 2500Remark: LS9 Performance Multilayer Head Gasket for LS9 engines, can also be used with All LS engines including 4. 8, 5. 3, 5. 7, 6. 0, 6. 2, 7. 0 blocks. These are possibly THE best gaskets for engines up to 4. 100" bore. These gaskets are the preferred gasket for Turbo, Nitrous, Heads Cam applications due to there superior strength. These head gaskets are 4. 100" bore, . 055" compressed thickness, 7 layers. For 2004 engines there are two different