Owners manual

INSTALLATION INSTRUCTIONS 3
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next to each other in the engine and in the firing order. If the voltage from the #5 wire is induced into #7
detonation could occur and cause engine damage.
To add more heat protection to your plug wires, MSD offers Pro-Heat Guard, PN 3411. This is a glass
woven and silicone coated protective sleeve that you slide over your plug wires. For extra protection of
the spark plug boots, MSD offers Pro Boot Guard, PN 3412.
Spark Plugs: Choosing the correct spark plug design and heat range is important when trying to get
the best performance possible. Since there are so many engine combinations and manufacturers, MSD
does not recommend which plug or gap is exactly right for your application.
It is recommended to follow the engine builder or manufacturer’s specification for spark plugs. With that,
you can then experiment with the plug gap to obtain the best performance. The gap of the plugs can be
opened in 0.005" increments, then tested until the best performance is obtained. MSD judges the plug
gap by compression and components.
These examples are just starting points to get you going in the right direction. Every application is different
and should be tested and tuned.
Welding: If you are welding on your vehicle, to avoid the
chance of damage, always disconnect both Heavy Power
cables of the MSD (You should also disconnect the tach
ground wire too).
Distributor Cap and Rotor: It is recommended to install a
new distributor cap and rotor when installing the MSD Ignition Control. The cap should be clean inside
and out especially the terminals and rotor tip. On vehicles with smaller caps, it is possible for the air
inside the cap to become electrically charged causing crossfire which can result in misfire. This can be
prevented by drilling a couple vent holes in the cap. The holes should be placed between the terminals,
at rotor height and face away from the intake. If your environment demands it, place a small piece of
screen over the hole to act as a filter.
MOUNTING
The MSD can be mounted in the engine compartment as long as it is away from direct engine heat
sources. It is not recommended to mount the unit in an enclosed area such as the glove box.
When you find a suitable location to mount the unit, make sure the wires of the ignition reach their
connections. Also be sure that the program dials can be accessed. Hold the Ignition in place and mark
the location of the mounting holes. Use a 3/16" bit to drill holes, install the vibration mounts and mount
the ignition.
Compression Spark Plug Gap
Up to 10.5:1: 0.050" - 0.060"
10.5:1 - 13.0:1: 0.040" - 0.050"
Above 13.0:1: 0.035" - 0.045"