A SOHC variant of the Quad 4 was intended to replace the Pontiac 2.5 L Tech IV OHV "Iron Duke" engine.
Debuting in 1992, this Quad OHC was an eight-valve engine and produced 120 hp (89 kW), 40 hp (30 kW) less than the Quad 4 of the same era.
Torque was 140 lb⋅ft (190 N⋅m).
Power dropped to 115 hp (86 kW) in 1993 with an attempt by GM to reduce the NVH of the engine.

Although power and fuel economy were better than the Tech IV, the Quad OHC was retired after 1994 when the DOHC version became standard.

Applications:
1992–1994 Oldsmobile Achieva
1992–1994 Pontiac Grand Am
1992–1994 Buick Skylark
A SOHC variant of the Quad 4 was intended to replace the Pontiac 2.5 L Tech IV OHV "Iron Duke" engine. Debuting in 1992, this Quad OHC was an eight-valve engine and produced 120 hp (89 kW), 40 hp (30 kW) less than the Quad 4 of the same era. Torque was 140 lb⋅ft (190 N⋅m). Power dropped to 115 hp (86 kW) in 1993 with an attempt by GM to reduce the NVH of the engine.
Although power and fuel economy were better than the Tech IV, the Quad OHC was retired after 1994 when the DOHC version became standard.
Applications:
1992–1994 Oldsmobile Achieva
1992–1994 Pontiac Grand Am
1992–1994 Buick Skylark
Quad 4 engine