Each kit is within a 1,000 RPM range. For example, the PN 8743 is supplied with: 3,000, 3,200, 3,400, 3,600, 3,800 modules.
MSD 8747 7000 Series Module Kit, Even Increments
MSD 87471 7000 Series Module Kit, Odd Increments
MSD 8747 RPM Module Kit, 7000 Series @ Speed Tech
MSD Performance 8747 Module Kit 7000 Series Even Increments
