Our steel harmonic balancers are extremely durable and efficient. The elastomer is bonded to the inside of the inertia ring and outside of the hub thanks to an improved design and premium adhesive. They feature a black finish and white timing marks for easy reading and installation. They are precisely designed and balanced for perfect fit and performance. This balancer has a removable external weight, which means it can be converted to internal balance. Fits late model Ford small block 5.0L engines, 6.4" diameter black with white markings. Engine balance Internal / External 50 oz Imbalance. the balancer timimg marks are 40°Before Top Dead Center to 0° Top Dead Center. Fits late model small block applications with three or four crankshaft pulley bolt holes. Pulley Spacer Is Required.