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85-270 2Valve 4.6L Upper Intake Phenolic Spacer Installation Instructions (PDF)
85-275 '87-'93 Ford EFI Throttle Body Space Installation Instructions (PDF)

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Questions and Answers

 

 

Why Choose Phenolic Spacers & Adapters?
Why Choose Aluminum Spacers & Adapters?
How Do I Gain Horsepower & Torque From A Spacer?


Why Choose Phenolic Spacers & Adapters?
We use phenolic in our carb spacers and adapters to stop the transfer of heat from the engine to the fuel system. Phenolic is made by compressing layers of resin soaked canvas under heat. It is well know for it’s superior insulation properties, finding use in the aerospace, automotive, and electronic industries. All our phenolic spacers have steel coil inserts to strengthen the mounting hole threads.

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Why Choose Aluminum Spacers & Adapters?
Our billet aluminum carburetor spacers and adapters, like our phenolic, improve air flow and performance. All spacers and adapters are precision machined to ensure a perfect fit and the flattest sealing surfaces. They are designed for certain tracks and racing classes which require aluminum instead of phenolic.

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How Do I Gain Horsepower & Torque From A Spacer?
Horsepower and torque increases can be found by increasing the plenum area under the carburetor. Depending on the design of the engine the exact height to lift the carburetor and style of spacer to use can vary. Our carburetor spacers and adapters are designed in several different styles and heights. Some are designed with four holes to match the configuration of the carburetor. This increases the barrel lengths of the carburetor and improves low-end response. Some spacers are designed to be completely open to increase the plenum area, this allows improved air/fuel distribution. These are generally beneficial in high RPM applications. Tapered or blended spacers use a four-hole design at the carburetor then open up gradually toward the manifold and can sometimes provide the best combination. We offer the styles and sizes that have proven to be the most successful. However, testing and tuning is required to verify the size and style that will provide the best result for your situation.

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