Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Black] They are manufactured from billet

They are manufactured from billet aluminum and require no drilling or welding for installation

Speedmaster offers these quality manual choke kits to help you change over to a hand-operated choke

This makes them far superior to standard OEM fasteners in terms of durability

performance and great value make these hardened input shafts an essential component for anyone looking to raise their transmission to the next level

the rod and main bearings

Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Black] They are manufactured from billetThe Speedmaster MID AIR design features the identical plenum and runner design as the normal mid rise. The main difference is that there is an open area under the plenum chamber. This feature is sometimes called an air gap design. The air flowing under the plenum provides a cooler charge for the incoming air with less heat transfer from the engine. This cooler air charge provides additional power and torque.