Quick view 1999 Pontiac Firebird 5.7L Head Gasket HG3159ZE12 1999 Pontiac Firebird 5.7L Head Gasket Engine Parts # HG3159ZE12 Fits: [1997-2004] AVANTI, GM / V8 / 5.7L / 350 OHV 16V [(LS1)]Fitment Notes: VIN G 16V OHV Product Information Warranty... MSRP: Was: Now: $25.97 Add to Cart