Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Black] unlike a stock 3-pinion style

unlike a stock 3-pinion style

The ends are factory-crimped to eliminate leakage

These EGR adapter fittings are designed for use with Speedmaster manifolds and will also work on similar Edelbrock EGR small block Chevy manifolds

you get reduced wear on the main bearings and timing gear

Due to the large-diameter 13 in

Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Black] unlike a stock 3-pinion styleThe 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.