Carburetor Spacer 4500 / 1.00" Tapered Lightweight (2.825" Bore) fuel FAST® engineers teamed up with

FAST® engineers teamed up with airflow specialists at RHS® to develop polymer intake manifolds for GM LS based engines

IAC port included

there is a $300

return spring

We port the plenum of the intake manifold all the way through the runners

Carburetor Spacer 4500 / 1.00" Tapered Lightweight (2.825" Bore) fuel FAST® engineers teamed up withWilson Manifolds Tapered Spacers feature a computer generated variable radius taper design that maximizes the airflow through the carburetor and enhances air fuel distribution for more horsepower. Part throttle performance and distribution are improved by redirecting the flow pattern created by the partially open throttle blades and gradually reducing the velocity of the air fuel mixture entering the plenum to allow for a smoother transition into each