Harmonic Balancer compatible with Ford 289. Crank Bore (Inches/mm)--1.37 (34.90mm), Large Pulley Dia (Inches/mm)--6.50 (165.10mm), Nose Dia (Inches/mm)--1.88 (47.70mm), Overall Width (Inches/mm)--3.01 (76.50mm), Weight (Lbs)--6.15