Rattler® Crankshaft Balancers

Fits Ford externally balanced small block V8 engines. Unit is 6 1/4-inch diameter, weighs 10 pounds, 2 ounces, has a standard 4-bolt pulley pattern and has a 28 oz.-in. counterweight.

The Rattler® is a pendulum absorber developed to control amplitudes of vibration and angle of crankshaft twist like no other design. Its ability to absorb rather than dampen is the key to its success. The Rattler® is effective for the entire RPM range, and extends crankshaft and bearing life. The Rattler® also has the ability to allow the engine to run smoother during operation, which can increase valve train stability and life.