Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] They also feature a spark

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

Speedmaster gaskets are designed for today's performance transmissions

then it is the installer's responsibility to verify fitment

you can count on Speedmaster for coolant temperature sensors

Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] They also feature a sparkThe 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.