Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster aluminum adapter spacers allow

Speedmaster aluminum adapter spacers allow you to adapt Powerglide to Turbo TH400 automatic transmission tailhousing

On engines over 500hp

These kits will support your entire electrical system from headlights to tail lights

If you want the awesome look of a chrome alternator but your GM alternator is working great

oxygen sensors

Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster aluminum adapter spacers allowThe Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise. 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.