FORM 1482M (REV. C) 04/05
INSTALLATION INSTRUCTIONS
75 SERIES BILLET HEI DISTRIBUTORS
INSTALLATION
GENERAL INFORMATION
1. Remove the distributor from the box and check for
Mallory 75 Series Distributors are similar to GM HEI
any shipping damage.
distributors, but with many advantages over the OEM
design, including:
2. Remove the cap and rotor from the new
distributor and check the gap between the pickup
• Billet aluminum housing with ball bearings and/or
and the reluctor with feeler gauges. The gap
self-lubricating bushings to support the centerless
should be between .015" and .030". If the gap is
ground 1/2" shaft.
wrong, loosen the two pickup screws and adjust
• Fully adjustable mechanical advance (0 – 28°).
the gap.
• High performance mechanical advance curve
3. Adjust the rev limiter (see Page 6 for instructions).
(24° all in @ 3200 rpm).
Replace the rotor.
• Fully adjustable vacuum advance.
4. If the old distributor is still in the engine, remove
• Mallory designed and manufactured HYFIRE module
the cap and note which spark plug wire the rotor
with a built-in adjustable rev limiter (5000-9500 rpm).
is pointing at. Trace that spark plug wire to the
• Indexed housing allows cap to be mounted four
spark plug and determine which cylinder it is.
different ways to provide more clearance in tight
5. Remove the old distributor.
engine compartments.
6. Install the new distributor (without the cap) with
• High performance cap and rotor (with brass
the rotor pointing in approximately the same
inserts) are manufactured in-house by Mallory from
direction as the old distributor. If the distributor
glass-filled polyester for higher strength and better
will not seat properly, remove the distributor and
electrical properties.
use a long screwdriver to rotate the oil pump drive
• High performance coil (Part No. 29215, included
in the engine.
in distributors with part numbers ending in “C”)
7. Place the new cap on the new distributor. The cap
combined with the Mallory module provide 8500+
will fit four different ways. Determine which of the
rpm capability (rpm may be lower when used with
four positions works best in your application.
other coils).
8. Note which cap terminal the rotor is pointing
• Available for many V8 engines including Chevy,
toward. Run a spark plug wire from that terminal
Ford, Pontiac, Buick, Olds, Chrysler, and AMC.
to the cylinder determined in Step 4.
9. Connect the rest of the spark plug wires to the
new cap in the same order as the old cap.
10. Install the distributor hold-down clamp so that it is
snug, but the distributor can still be rotated with a
little effort.
11. Install the coil onto the cap and connect the wire
harness from the distributor to the coil.
12. If you are replacing an existing HEI distributor, the
wiring harness from the ignition switch can now
be plugged into the coil. If you are replacing
something other than an HEI distributor, a 1/4"
female tab connector can be used to connect the
wire from the ignition switch to the coil.
See Figure 3.
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