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ZZ427/480 and Component Information
Ignition System
The high energy ignition (HEI), part number 88961867, included with the ZZ427/480 is a self-contained ignition system that includes
a magnetic pick up, a module, coil, rotor, and cap. The HEI's large diameter cap minimizes arcing and crossfiring between adjacent
spark plug terminals. The cap's male terminals provide a reliable, positive connection for the spark plug leads. However, the HEI's
large diameter cap may interfere with other under hood components in vehicles not originally equipped with HEI systems. Check for
adequate clearance before installation. The HEI distributor incorporates a hardened alloy drive gear that is compatible with a steel cam
gear. Use of a non-hardened distributor gear will result in excessive wear.
The HEI system requires a 12-volt power supply for proper operation. The HEI system should be connected directly to the battery
with a 10 or 12 gauge wire through a high quality ignition switch. If you are installing an HEI in an early-model vehicle originally
equipped with a point-type ignition, be sure to remove or bypass the resistor in the wiring harness to ensure the HEI receives 12-volts
continuously. Use distributor connector package, part number 12167658, which includes connectors and wires for the HEI's tachometer
and 12-volt terminals.
Please be advised that the distributor included with this engine is now equipped with an alternative tachometer feed (green
wire) and a rev limiter. The rev limiter has been pre-set to the recommended MAX RPM for the engine (6500 RPM).
Timing Information
Set base timing spark timing at 10°-12° BTDC at 1000 RPM with the vacuum advance line to the distributor disconnected and plugged.
This setting will produce 34°-36° of total advance at wide open throttle (12° base timing + 24° centrifugal timing = 36° total timing above
4000 RPM).
Flexplate
The ZZ427/480 has an automatic transmission flexplate included with the engine assembly, part number 12561217. If a manual
transmission is to be used, a manual flywheel, part number 12582964, must be purchased separately.
Important
Both engines are internally balanced and require internally (zero) balance mating components. Always tighten the fasteners
in a "star" pattern to 30 ft.lbs. first then to final torque value.
Pilot Bearing
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing
aligns the transmission input shaft with the crankshaft centerline. A roller pilot bearing, part number 14061685, is recommended for this
engine. The heavy duty bearing adds an extra margin of reliability to a high performance drive train.
Indicator Tube
The indicator and indicator tube come installed on the engine. One end is pushed into the hole on the oil pan and sealed with an
o-ring. The other end is fastened to the block using a bolt and a spacer. When removing the dipstick to install the engine or headers,
be sure not to loose the small o-ring which seals the dipstick tube to the pan. The o-ring must be reinstalled on the dipstick tube before
inserting it into the pan. Make sure the tube is bottomed out in the pan before tightening the dipstick tube to the header bolt. Also, the
spacer and fastener that were attaching the dipstick tube to the engine will not be required once the headers are installed. They were
for shipping purposes only.
Carburetor
Please refer to the documentation supplied with the carburetor for installation and tuning instructions. There is also an informative
DVD included with the carburetor package that will be helpful for tuning the carburetor based on your intended application and
environmental conditions. If you have technical questions regarding the carburetor or cannot locate the instructions, please contact the
carburetor manufacturer. The air cleaner size should be at least 14.0" in diameter and a minimum of 3" tall or with equivalent surface
area to allow adequate air flow to the engine.
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ZZ427/480 (19166393) Deluxe Specifications
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