dgc333
Well-Known Member
The 13R means the distributor has 13 degrees of mechanical advance or 26 when you start looking at the crank with a timing light. It will likely require that you shorten the slots as the cam you uses has more duration/overlap than stock to get the initial timing where it needs to be for a clean idle and good off idle throttle response.
As for springs if you got this distributor from Mopar Performance it will already have a fast advance rate and it's unlikely you need to do anything with the springs.
As for springs if you got this distributor from Mopar Performance it will already have a fast advance rate and it's unlikely you need to do anything with the springs.