Ford 351W Windsor LowRise Aluminum Intake Manifold [Black] The outer case is made

The outer case is made from 8620 Chrome-Nickel-Moly steel and the case hardened for long life

so they are meant to last

Designed for absolute flow and fuel delivery

Speedmaster GM automatic transmission parts are manufactured using the highest-quality materials for strength and durability

the amount of oil flow required to the valvetrain is greatly reduced

Ford 351W Windsor LowRise Aluminum Intake Manifold [Black] The outer case is madeThe Speedmaster LowRise Manifolds are our lowest profile manifold and is also the only one that is street legal on pollution controlled vehicles. It is set up to accept a spread bore carb but comes with an adapter plate that permits the use of square bore carbs. To remain street legal with a square bore carb, you must use one that is also approved as street legal for your application.