Pontiac 326 350 389 400 421 428 455 HiRise Aluminum Intake Manifold [Polished] The needle and seat assemblies

The needle and seat assemblies that are installed in Speedmaster carburetors can sufficiently control fuel pressure up to about 8 psi

making belt alignment straight forward when blower snout lengths change with custom supercharger setups

and corrosion-treated

The Speedmaster Snapback cap is a pre-curved bill Baseball style hat

If you are looking to build a 400-500+hp engine

Pontiac 326 350 389 400 421 428 455 HiRise Aluminum Intake Manifold [Polished] The needle and seat assembliesThis manifold is a single plane manifold that will fit under all Pontiac hoods including the Trans Am "Shaker" hood. It accepts a stock Quadrajet carb but we also include an adapter plate for standard square bore carbs. This manifold is designed to work with cylinder heads up to 300 CFM. It is also available machined for injectors.