Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Black] They will fit 8

They will fit 8

These EGR adapter fittings are designed for use with Speedmaster manifolds and will also work on similar Edelbrock EGR small block Chevy manifolds

The ends are factory-crimped to eliminate leakage

Speedmaster cylinder head fasteners are made from aircraft quality 8740 high tensile strength chromoly steel and cold-forged to ensure molecular integrity

Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold [Black] They will fit 8The Speedmaster MID AIR design features the identical plenum and runner design as the normal mid rise. 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.