Our Pro Series Ready to Run Distributor is perfect for a street performance ignition upgrade and eliminates the need to a CDI box. It features a CNC-machined billet aluminum body and hardened steel shaft, with a sealed ball bearing on top and a sintered steel bushing on the bottom. It also comes with a fully adjustable mechanical advance, magnetic pickup trigger, a vacuum advance (not adjustable), and a high-output circuit board module with digital tach output. The dielectric cap comes with solid brass terminals and a color-matched wire retainer. Fits 1949-1953 Only Ford 239-255 Flat Head V-8 Engines. The distributor offers a fully adjustable mechanical advance with included springs and weights. Will not replace direct camshaft-driven horizontally-oriented distributors found in 1948 and earlier engines