Edelbrock Pro-Tuner, User Manual

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Make sure to install the spark plug wires one at a time and verify they are in the
correct position. A wire retainer is supplied to secure the wires to the cap. Align the
retainer with the mounting bosses, and use the supplied 1.5” self-tapping screws to
secure the retainer.
ROTOR PHASING
Rotor phasing is defined as the alignment between the rotor tip and the distributor cap
terminal when the spark occurs. This position can be very important to your engine’s
performance. If the alignment is incorrect, the spark will jump to the next closest
terminal, or another ground resulting in a misfire and loss of power. In applications with
extreme cylinder pressures, such as with nitrous or forced induction, correct rotor
phasing increases in importance. More voltage is required to ionize the plug gap and if
rotor phasing is off, the spark is more apt to find an easier path to ground rather than
the correct cap terminal. This may result in severe engine damage.
Figure 15
CARE AND MAINTENANCE
Periodically, visually inspect the cap terminals and rotor tip for wear and look for traces
of carbon tracking where spark scatter occurs. Check your spark plug wires for burns or
tears. It is also recommended to periodically test the resistance of the wires. See
for an
exploded view of the distributor and its parts.