Chevy GM LS3 Dual Plane 4150 MID-AIR™ MidRise Aluminum Intake Manifold [Black] Speedmaster flexplates make excellent upgrades

Speedmaster flexplates make excellent upgrades to your stock design

Use the stock Quadra-Jet carb or 500-650 cfm vacuum secondary carburetor

They're available in round and oval styles

Our dual plane big block manifold is now available with rectangular ports

Chevy GM LS3 Dual Plane 4150 MID-AIR™ MidRise Aluminum Intake Manifold [Black] Speedmaster flexplates make excellent upgradesThe 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.