The instructions that MSD supplies with its distributors (also available at www.msdignition.com) contain several charts and graphs ... as well as the effects each spring package has on the rate.

Check out the following chart from MSD: If you take a look at this ... Then record the spring combination in the distributor. Increase the engine speed, and log the speed at which the curve ...

Check out the following chart from MSD: If you take a look at this ... Then record the spring combination in the distributor. Increase the engine speed, and log the speed at which the curve ...