The Holley 500 two-barrel carburetors were made just for circle track racing. This particular model is modified for race use. Race-modified carbs get the choke and related machining provisions for smoother airflow, while a brass block-off plate keeps unfiltered air from entering the carb through the choke rod hole. HP metering blocks are reinforced for strength and are specially designed for optimum fuel atomization. Fuel slosh/vent baffles provide fuel control during hard acceleration and braking. Stainless steel throttle plates and power valve blowout protection are just a few of the features on these NASCAR eligible carburetors. These carbs will pass the Go/No-Go tests commonly run at racetracks, so no fear of getting caught cheating! Holley 500 carbs come with a 74 main jet and a 3.5 power valve.
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