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Improved performance Brand name you can trust Made to last Color : black For over 100 years Holley has been the go to resource of fuel systems for automotive innovators professional drivers and weekend racers alike. Holley carburetors have powered every NASCAR Sprint Cup team and nearly every NHRA Pro Stock champion for over four decades. Holley doesn’t just design engineer and assemble their parts they also put them through a rigorous testing phase in their Vehicle Lab. Bench testing lab testing and live tests on an NHRA track all combine to help Holley maintain its performance promise. t’s the attention to quality and detail at every level that has made Holley a trusted expert in fuel system technology for automobiles. There’s a reason that Henry Ford called on them.