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Power Plenum

Posted in How To on February 18, 2003
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It's been a secret in racing for years: Spacer plates under the carburetor will increase intake manifold plenum volume and power.

POWERAID of Scottsdale, Arizona, has applied the same power principal for today's throttle-body motors and literally added its own twist.

POWERAID's throttle-body spacers feature a unique Helix Bore design that enhances mid-range power and torque while improving throttle response.

The patented Helix Bore threads on the nside of the spacer cause the incoming air charge to tumble, or spin, for better atomization of the mixture downstream in the combustion chamber, according to POWERAID.

Installation on TBI trucks is easy, since the kit comes complete with new throttle-body bolts, gaskets, and full instructions. The following photos highlight a typical TBI install.

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A typical GM TBI setup looks just like this. The spacer goes between the throttle-body and intake manifold. A typical GM TBI setup looks just like this. The spacer goes between the throttle-body and intake manifold.
Installation is truly a bolt-on affair. Begin by unbolting the throttle-body from the intake manifold. Installation is truly a bolt-on affair. Begin by unbolting the throttle-body from the intake manifold.
With the throttle-body unbolted from the intake, the stock gasket can be removed. At this point, you also have to loosen the clamp that holds the fuel lines to the transmission bell housing. With the throttle-body unbolted from the intake, the stock gasket can be removed. At this point, you also have to loosen the clamp that holds the fuel lines to the transmission bell housing.
The new spacer and gaskets simply slip under the throttle-body. The kit includes longer mounting bolts to accommodate the spacer. The new spacer and gaskets simply slip under the throttle-body. The kit includes longer mounting bolts to accommodate the spacer.
Once the spacer and gaskets are squared on the manifold and the bolts hand-tightened, they can be torqued to spec. Once the spacer and gaskets are squared on the manifold and the bolts hand-tightened, they can be torqued to spec.
The finished install should look like this. The finished install should look like this.

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