Apex AMS3400 Fuel Injection Plenum Gasket Set - Upper

Fuel Injection Plenum Gasket Set for GM V6 Applications

The Apex AMS3400 fuel injection plenum gasket set is built for upper intake sealing on select 1991-1994 GM vehicles. It is a direct-fit sealing solution for service work on the Chevrolet Cavalier, Chevrolet Lumina, Pontiac Sunbird, Buick Regal, Chevrolet Corsica, Oldsmobile Cutlass Supreme, Pontiac Grand Prix, and Pontiac 6000.

Key Features

• Fuel injection plenum gasket set for upper intake service
• Fits 1991-1994 Chevrolet Cavalier, upper
• Fits 1991-1994 Chevrolet Lumina, upper
• Fits 1991-1994 Pontiac Sunbird, upper
• Fits 1992-1993 Buick Regal, upper
• Fits 1991-1993 Chevrolet Corsica, upper
• Fits 1991-1993 Oldsmobile Cutlass Supreme, upper
• Fits 1991-1993 Pontiac Grand Prix, upper
• Fits 1991 Buick Regal, upper, exc. Sequence No. 40001-800000
• Fits 1991 Pontiac 6000, upper
• Part number AMS3400 for ordering and service identification

Detailed Description

Apex AMS3400 is an upper fuel injection plenum gasket set for GM applications that require a reliable seal between intake components. It is used on 1991-1994 Chevrolet Cavalier and Chevrolet Lumina, 1991-1994 Pontiac Sunbird, 1992-1993 Buick Regal, 1991-1993 Chevrolet Corsica, 1991-1993 Oldsmobile Cutlass Supreme, 1991-1993 Pontiac Grand Prix, and 1991 Pontiac 6000. The AMS3400 helps restore proper sealing at the upper intake plenum during intake service and reassembly.

What It Is Used For

• Upper intake plenum gasket replacement during intake manifold service
• Repairing vacuum leaks at the plenum sealing surface
• Addressing rough idle caused by intake air leakage
• Correcting drivability issues tied to degraded intake seals
• Replacing worn or damaged sealing material on GM V6 upper intake assemblies

Installation Notes and Tips

Confirm engine and sequence-number fitment before installation, especially for the 1991 Buick Regal application noted as excluding Sequence No. 40001-800000. Clean both mating surfaces thoroughly before assembly and follow the vehicle service manual for torque sequence and tightening specifications. Verify the upper intake alignment before final assembly to maintain a proper seal.

Quality Assurance

Apex identifies this part as AMS3400 for accurate cataloging and application matching. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.