Holley four-barrel carburetor with vacuum secondary diaphragm on…
A Holley four-barrel carburetor sitting on brown cardboard in sunlight, photographed from above at a three-quarter angle. The gold-cadmium-plated body shows the cast HOLLEY logo on the metering block side, a red plastic choke-rod cap, brass fuel inlet fittings, vacuum secondary diaphragm housing at right, and the external fuel transfer tube looping across the front.
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