Chevy SBC 350 1957-95 MID-AIR™ MidRise Aluminum Intake Manifold [Black] If it has to seal

If it has to seal right the first time Speedmaster has what you need

Speedmaster rear-end assemblies are the ultimate solution

The quality of these throttle bodies are better than others available today

exhaust gaskets

This manifold will typically produce more power than any similar competitive manifold due to larger ports and runners

Chevy SBC 350 1957-95 MID-AIR™ MidRise Aluminum Intake Manifold [Black] If it has to sealThe 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.