Professional Products 80006 PowerForce harmonic damper balancer. Fits 1963-1980 Ford 289 302 351W engines. These dampers are manufactured to match the dimensions of the stock early 1963-1969 small block Ford dampers. The outside diameter and the thickness are the same. The counterbalance weight matches the stock 28 ounce and the overall balance specifications are held tighter than the original O.E.M. damper. These dampers have both the early 3 bolt accessory pulley bolt pattern and the later 4 bolt as well. This will allow the use of late model serpentine drive systems on early engines if desired. The counterweight for this damper is removeable, so if you want to build a neutral balance engine, you can use this damper by simply removing the bolt in counterweight on the back of the damper. 6.4" diameter. Weight of 9.52 pounds. Nodular iron construction. Painted semi-gloss black with white timing marks etched for easy reading. Works great for high performance street engines and for stock replacement applications. The SFI-Spec racing damper is available below. Professional Products 80006 90006 PowerForce Plus harmonic damper Ford 289 302 351W harmonic damper balancer 80006 Professional Products 90006 PowerForce Plus harmonic damper balancer. Ford small block 289 and 302 A SFI-Spec racing harmonic damper that also works great for hot street engines. Made of 1045 steel with high temperature elastomer bonded to the hub and ring for durability. Number 8-32 stainless steel machine screws are used to secure the plate. Measures 6.4" in diameter. Weighs in at 10.25 pounds. Damper has less than .005" runout. These dampers are manufactured to match the dimensions of the stock early 1963-1969 small block Ford dampers. The outside diameter and the thickness are the same. The counterbalance weight matches the stock 28 ounce and the overall balance specifications are held tighter than the original O.E.M. damper. These dampers have both the early 3 bolt accessory pulley bolt pattern and the later 4 bolt as well. This will allow the use of late model serpentine drive systems on early engines if desired. The counterweight for this damper is removeable, so if you want to build a neutral balance engine, you can use this damper by simply removing the bolt in counterweight on the back of the damper. 90006 Professional Products 81007 harmonic balancer spacer. For use with Professional Products small block Ford balancers. See chart above to select the correct part number for your application. 81007 Professional Products 81008 harmonic balancer spacer. For use with Professional Products small block Ford balancers. See chart above to select the correct part number for your application. 81008 Professional Products 81006 harmonic balancer spacer. For use with Professional Products small block Ford balancers. See chart above to select the correct part number for your application. 81006 We welcome CANADIAN customers! For ordering information, click on "Orders To Canada" at the top left side of this page. PAYMENT METHODS: PayPal, Visa, Mastercard, Discover, American Express, money orders.