MSD 8478 Ford 351W Street Pro-Billet Installation - Manual (Page 3)

INSTALLATION INSTRUCTIONS 3
M S D
• W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
CENTRIFUGAL ADVANCE CURVE
SELECTING THE ADVANCE SPRINGS
The rate, or how quick the advance comes in is determined by the type of springs which are installed
on the distributor. The MSD distributors are equipped with two Heavy Silver springs installed (Figure
2). These will give you the slowest advance curve possible. The parts kit contains two additional
sets of springs which can be used to match the advance curve to your particular application. Refer
to the Spring Combination Chart (Figure 3) for combinations that can be achieved.
To change the springs, remove the cap and rotor and use needlenose pliers to remove the springs.
Be sure the new springs seat in the groove on the pin.
Figure 2 The Factory Equipped Curve. Figure 3 Spring Combination Chart.
Figure 4 Advance Curves.
SPRING COMBINATION RATE OF ADVANCE FIGURE 4
2- Heavy Silver SLOWEST A
1- Heavy Silver B
1- Light Blue
1-Heavy Silver C
1-Light Silver
2- Light Blue D
1- Light Silver E
1- Light Blue
2- Light Silver FASTEST F
Timing Curve From Factory