Chevrolet Performance ZZ4 Mode D'emploi page 4

FIRING ORDER : 1-8-4-3-6-5-7-2
Component Information:
Intake Manifold:
This ZZ4 engine comes with a Chevrolet Performance Parts dual plane intake manifold part number 10185063 designed for use
on all small blocks through 1986. This intake manifold was designed with a dual pattern carb flange. This intake manifold does
have provisions for late model accessory brackets, an exhaust gas recirculation (EGR) valve and an integral hot air choke.
Water Pump:
The ZZ4 engine comes with a long style cast iron water pump part number 88894341, the water pump includes gaskets. The
cooling system has a 180° F thermostat.
Ignition System:
The HEI (High Energy Ignition) distributor part number 93440806 included with the ZZ4 engine is a selfcontained ignition system
that includes a magnetic pickup, a module, a coil, a rotor, and a cap. The HEI's large diameter cap minimizes arcing and cross-
firing 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 underhood components in vehicles not originally equipped
with HEI ignition systems. Check for adequate clearance before installation. The HEI distributor supplied with the ZZ4 has a
hardened (melonized) drive gear that is compatible with a steel camshaft. 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 ignition system should be connected directly to
the battery with 10 or 12 gauge wire through a high quality ignition switch. If you are installing an HEI ignition 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.
Set spark timing at 32º before top dead center (BTDC) at 4000 RPM with the vacuum advance line to the distributor
disconnected and plugged. This setting will produce 32º of total advance at wide open throttle (WOT). The HEI vacuum advance
canister should remain disconnected. This engine is designed to operate using only the internal centrifugal advance to achieve
the correct timing curve.
Caution
This engine assembly needs to be filled with oil and primed. You should add the specified oil (see start-up instructions) to your
new engine. Check the engine oil level on the dipstick and add accordingly.
19172321
4 27
ZZ4 Engine Long Block Specifications REV 09JA15
TITLE PART NO.
SHEET OF