What crank 1970 318?

Vibration dampers will be different depending on application. There are a few factors that determine what damper is on the engine. The amount of inertia required is determined by the torsional amplitude requirement/specification. The frequency is determined by the spring rate of the crankshaft, rotating and reciprocating masses and cylinder pressure. The damper should be tuned to attenuate the resonant frequency of the crankshaft system. A undertuned damper can push the torsionals to the higher RPM range. A overturned damper will push the torsionals to the lower RPM range. Automatic and manual transmissions can use different dampers based on the above factors. Most people have no idea what that resonant frequency is once they build an engine with various components. That's why an ATI or Fluid damper should be used. These type dampers operate over a larger RPM range and are not tuned to a specific frequency. 65'