Chrysler Mopar BB 413 426 440 HiRise Aluminum Intake Manifold [Polished] you must use one that

you must use one that is also approved as street legal for your application

They have injector bosses precisely positioned and machined for excellent fuel spray patterns and maximum power

voltage-insulating material

The Speedmaster high mount serpentine kit for Chevy LS engines

They're available in several sizes to fit your valve covers

Chrysler Mopar BB 413 426 440 HiRise Aluminum Intake Manifold [Polished] you must use one thatStep up to the high rpm power of an open plenum with Speedmaster HiRise intake manifolds. These cast aluminum manifolds accept square bore carburetors and are pressure tested to ensure maximum performance. They start to make awesome power around 3,000 rpm.