Speedmaster 1-147-020 BBC 454 Oval Port MidRise Air Intake Manifold Polished

The Speedmaster 1-147-020 is a polished, machine-finished MidRise Air intake manifold for Chevy big block (BBC) 454 engines with oval port cylinder heads.

Key Features:

• MidRise Air design: uses the same plenum and runner design as the standard MidRise manifold
• Air gap construction: an open area under the plenum chamber lets air flow beneath the plenum
• Cooler intake charge: the air gap reduces heat transfer from the engine to the incoming air
• Oval port design for Chevy BBC 454 applications
• Polished finish

By keeping the incoming air charge cooler, the air gap design helps deliver additional power and torque.