Heavy-Duty SFI Flexplate1963-1988 Ford 289-351W164-ToothInternally BalancedBolt Pattern (11.50 in.)0.140 in. ThickChromoly Steel14.13 in. DiameterSFI 29.1 Rated JEGS 601095 Heavy-Duty Flexplate for use with 1963-1988 Small Block Ford 289, 302 & 351W internally-balanced engines is engineered to handle extreme-duty applications and designed to take the punishment of today's high-horsepower engines. This Flexplate is .035 in. thicker than stock and has a 29.1 SFI approval stamped into the face of the plate.