Chevy BBC 454 Oval Port MID-AIR™ MidRise Aluminum Intake Manifold [Black] The LS (Gen3/4) platform has

The LS (Gen3/4) platform has many design benefits over the earlier SBC engine designs

aircraft-style cap and -10 AN pickup

Every Speedmaster flexplate is 29

The Speedmaster 9" solid pinion bearing spacer kit is designed to retain the pinion depth settings for greater strength and reliability

Chevy BBC 454 Oval Port MID-AIR™ MidRise Aluminum Intake Manifold [Black] The LS (Gen3/4) platform hasThe 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.