Manley Chevy SBC LS-Series NexTek Series High Performance Valve Springs (2 valves per cylinder) 1987-1990 Chevrolet Camaro Iroc-Z, 1991-1992 Chevrolet Camaro Z28, 1998-2002 Chevrolet Camaro Z28, 1985-1992 Chevrolet Corvette Base, 1986-1986 Chevrolet Corvette Indianapolis 500 Pace Car, 1988-1988 Chevrolet Corvette 35th Anniversary Edition, 1990-1992 Chevrolet Corvette ZR-1, 1997-2004 Chevrolet Corvette Base, 1987-1992 Pontiac Firebird Trans Am, 1987-1988 Pontiac Firebird Base, 1989-1992 Pontiac Firebird Formula, 1989-1992 Pontiac Firebird Trans Am GTA, 1998-2002 Pontiac Firebird Formula, 2004-2004 Pontiac GTO Base,
1987-1990 Chevrolet Camaro Iroc-Z
1991-1992 Chevrolet Camaro Z28
1998-2002 Chevrolet Camaro Z28
1985-1992 Chevrolet Corvette Base
1986-1986 Chevrolet Corvette Indianapolis 500 Pace Car
1988-1988 Chevrolet Corvette 35th Anniversary Edition
1990-1992 Chevrolet Corvette ZR-1
1997-2004 Chevrolet Corvette Base
1987-1992 Pontiac Firebird Trans Am
1987-1988 Pontiac Firebird Base
1989-1992 Pontiac Firebird Formula
1989-1992 Pontiac Firebird Trans Am GTA
1998-2002 Pontiac Firebird Formula
2004-2004 Pontiac GTO Base