HOLLEY Model 6500 2-Barrel: Description

Carburetor is a 2 stage, 2 venturi type with primary venturi smaller in diameter than secondary. Secondary stage is operated by mechanical linkage. Primary stage includes curb idle, accelerator pump, idle transfer, main metering and power enrichment systems. Secondary stage includes secondary idle system, transfer, main metering and power enrichment systems. A single fuel bowl supplies fuel for both stages. All models use an integral-type automatic choke with electric assist heater.

For improved engine starting when engine is warm, all carburetors utilize a vacuum-operated fuel bowl vent valve. This allows fuel vapors to vent into carbon canister when engine is off. With engine running, fuel vapors are vented into air horn of carburetor. All models use integral-type electrically heated choke.