- Absolutely the most
powerful HEI Module
available.
- 32 Mhz controller
manages the extreme
current for full output
at racing rpm.
- Adjustable rev limiter
from 5,000 – 10,000
rpm.
- Built-in Traction Control Detection technology.
- Independent
tach output lead provides a
clean and reliable 12
volt signal.
- All new, injection molded cap, rotor and
coil cover.
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Extreme HEI
Performance Kit

After
nearly 30 years since its introduction, who would have thought that
the GM HEI distributor would still be used in thousands of cars.
The aftermarket is ripe with replacement HEI modules, coils and caps,
but no one has reinvented the HEI, until now! MSD’s Extreme Output
HEI system features an amazing ignition module that is capable of producing
up to 20 Amps to drive the coil! Yes, 20 Amps! Obviously, an oversized
coil is required to handle this energy so our engineers devised an
all new coil which can deliver over 100 millijoules of energy across
the plug gap. All of this energy is monitored and controlled cylinder
to cylinder by a 32 Mhz RISC microcontroller.
To
handle all of this energy and the larger coil, a new cap and rotor
had to be engineered. Our HEI Cap is molded from DuPont Rynite material
which has high dielectric properties. The Cap must be used in order
to fit the larger Extreme Output Coil, and it can still be installed
on factory distributor housings.
Extreme
Output HEI Kit,
Supplied with Module, Coil, Cap, Rotor and Dust Cover
PN 8502* 
INDIVIDUAL COMPONENTS:
Extreme Output Module, 20 Amp
PN 83641* 
Extreme Output HEI Coil
PN 8220* 
MSD Extreme HEI Cap
PN 84111 
MSD Extreme HEI Rotor
PN 84101 
| TRACTION CONTROL DETECTION |
| In the majority of racing sanctions and classes, traction controlling
devices are
illegal. MSD has never produced a traction control - and while
it remains illegal, never will produce one. What we have designed
is a code that will detect if an electronic traction control system
is used with an HEI.
This Traction Control Detection (TCD™) technology carefully
monitors and examines the signals of the ignition. If the TCD determines
that any signal has been modified in any way, the ignition will
be put into a low rpm rev limit mode that will immediately slow
the car. Before this rev limit is imposed, the TCD goes through
a list of cycles and checks to qualify that the trigger signal
has been modified.
- Advanced circuitry constantly
monitors the ignition’s
signals.
- A rev limit mode
will be activated if traction control is detected.
- Proprietary
technology is pending a U.S. Patent.
TCD Technology is available in two HEI Modules:
7.5 Amp, with Rev Limiter
PN 83645*
Extreme Output, 20 Amp, with Rev Limiter
PN 83641*
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*Not
legal for sale or use on pollution controlled vehicles.
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