FST Performance Billet X-treme Carburetors: Modern Air and Fuel Mixers for Traditionalists

Some people like their burgers medium-rare, some like them well-done. Neither one is wrong. Same goes with air and fuel delivery. Electronic fuel injection is just the ticket for hot rodders that like tuning with a computer, while carbs are for guys that like tuning with a screwdriver.

For you traditional types, Summit Racing has FST Performance Billet X-treme Series Carburetors. Designed for serious street and racing use, the Billet X-tremes have plenty of modern features for easy tuning and excellent performance:

• CNC-machined 4150-style billet aluminum main body
• 2-circuit billet aluminum metering blocks with five removable emulsion bleeds for excellent tunability
• Billet aluminum baseplate drilled for 4150 and 4500 mounting flanges
• 4-corner idle adjustment
• Quick-change jets and idle circuit air bleeds
• 30cc accelerator pumps

The Billet X-treme carburetors also feature FST’s Viper billet aluminum fuel bowls. The bowls have center-hung nitrophyl floats, internal baffling to prevent fuel slosh, dual fuel sight windows, and dual drain plugs so you can replace the jets without removing the bowls. The Viper bowls also have three inlet fittings—a center-mount -8AN O-ring inlet and two traditional 7/8-20 side inlets—to make fuel system connections more convenient.

Another nice feature is the built-in bracket for a Throttle Position Sensor (TPS), which is required when using an electronically-controlled overdrive automatic transmission or a data logger designed to use a TPS signal.

If you need more tuning flexibility, step up to the Billet X-treme Pro carburetor. It has three-circuit blocks that allow part-throttle tuning between idle and when the main metering circuit begins to flow fuel. This OnAllCylinders article explains two- vs. three-circuit metering more fully.

FST Billet X-treme carburetors are available in 650 and 750 CFM ratings with vacuum or mechanical secondaries. The Billet X-treme Pro carburetors are available in 850, 950, and 1,050 CFM ratings with mechanical secondaries only.

SEE FST PERFORMANCE BILLET X-TREME SERIES CARBURETORS AT SUMMIT RACING