Chevrolet, 5.3L - 6.2L LS1, LS2, LS3, LS6, L99 Car (including Corvette), 4.8L - 6.0L (GM Truck Vortec), 6.0L/6.2L LS1 HUMMER 2/Set 1-7/8" Dia. Round Port. Compare to Fel-Pro MS92467. Fits the following applications: Calloway, Vin Code "G", LS1, (1999) GM Car: 325/ 5.3L - LS1 Vortec ('05-'08) 346/ 5.7L - LS1 ('97-'08) GTO (2004), Camaro And Firebird ('01-'02) 346/ 5.7L - LS6 ('01-'05) Vin Code "S" 364/ 6.0L - LS2 ('05-'07) Vortec/6.2L (2008 And Up)GM Truck: 293/ 4.8L Vortec ('99-'08) 325/ 5.3L Vortec ('99-'08) 364/ 6.0L Vortec ('99-'08) HUMMER: 6.2L - LS1 ('02-'09) 6.0L - LS1 ('02-'09) Isuzu Truck 5.3L ('03-'07) For Manifold and Header Applications Corvette Header Applications: 5.7L (1997 - 2000 Header And Manifold / Headers Only 2001-2004) 6.0L (2005 - 2007) 6.