These billet aluminum fuel rails make a great addition to any GM LS1, LS2, LS3, LS6, or L99 engine bay. They are direct bolt-on rails for OE-style intake manifolds and are machined from solid aluminum with the undersides relieved for ultimate weight savings. The aluminum is finished in a high-gloss anodizing making it both durable and good-looking. Fuel rail kits come with matching hand-polished fittings and a stainless braided hose. Both the fuel rail set and kit come with -6 to 3/4-16 O-ring adapters but are machined to also accept -8 O-ring fittings available separately to fully take advantage of the 5/8-inch diameter fuel passage. For more information contact Holley Tech Service, 1801 Russellville Road, Bowling Green, KY 42101. Telephone 270-781-9741. For nearest dealer: 1-800-HOLLEY-1