Engine Intake Manifold Plenum – ACDelco (12555840)

Engine Intake Manifold Plenum distributes intake charge from the throttle body to the cylinder head ports. Runner length and plenum volume are tuned to the engine, so a manifold from another build changes the torque curve even when the bolt pattern matches.

Replace the Intake Manifold Plenum when a lean or misfire code traces to a leaking flange, when the plenum is cracked, or when a mounting bolt hole has pulled out. Check for a vacuum leak at the gasket surface before ordering.

For this Intake Manifold Plenum the reference is 12555840, in our Throttle Bodies & Intake range. Compare it with the number on the part you are replacing rather than with a photograph.

This is genuine ACDELCO stock, supplied for the Intake Manifold Plenum with the manufacturer number intact so the reference on the box matches the catalogue.