Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster gaskets are designed for

Speedmaster gaskets are designed for today's performance transmissions

They also feature a spark plug style terminal and a threaded brass primary stud

These rotors are made from high-quality materials to exacting standards for perfect fit and function

you can count on Speedmaster for coolant temperature sensors

Speedmaster aluminum crankshaft pulleys are manufactured from 356 aluminum that is heat-treated to T-6 specs

Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster gaskets are designed forThe 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.