1. After installing
the engine, ensure the crankcase has been filled with 20w50
racing motor oil (non-synthetic) to the recommended oil fill
level on the dipstick. Also check and fill as required any other
necessary fluids such as coolant, power steering fluid, etc.
2. The engine should
be primed with oil prior to starting. Do this by using an engine
oil priming tool. If you do not have one, one can be obtained
through GM, part number 12368084. Follow the instructions enclosed
with the tool. This is the sure way to get oil to the bearings
before you start the engine for the first time. Also, prime
the engine if it sits for extended periods of time. See short
block instructions, GM part number 86962927, for further information.
3. Safety first.
If the vehicle is on the ground, be sure the emergency brake
is set, the wheels are chocked and the car cannot fall into
gear. Verify everything is installed properly and nothing was
missed.
4. Start the engine
and adjust the initial timing. Set the ignition timing to 20°
before top dead center (BTDC) and the engine idle to 950 RPM
(ZZ572/620) or 1200 RPM (ZZ572/720R) with a timing light and
the vacuum disconnected and plugged. Rotate the distributor
counterclockwise to advance the timing. Rotate the distributor
clockwise to retard the timing. Leave the vacuum advance disconnected.
5. When possible,
you should always allow the engine to warm up prior to driving.
It is a good practice to allow the oil sump and water temperature
to reach 180°F before towing heavy loads or performing hard
acceleration runs.
6. Once the engine
is warm, set the total advance timing to 36°F at 4000 RPM.
7. The engine should
be driven at varying loads and conditions for the first 30 miles
or one hour without wide open throttle (WOT)
or sustained high RPM accelerations.
8. Run five or six
medium throttle (50%) accelerations to about 5000 RPM and 55MPH
(if application is a vehicle), and back to idle (0% throttle)
in gear.
9. Run two or three
hard throttle (WOT 100%) accelerations to about 5000 RPM and
55 MPH (if application is a vehicle), and back to idle (0% throttle)
in gear.
10. Change the oil
and filter. Replace with 20w50 racing motor oil (not synthetic)
and a PF35L AC Delco oil filter. Inspect the oil and the oil
filter for any foreign particles to ensure that the engine is
functioning properly.
11. Drive the next 500 miles under normal conditions or 12 to
15 engine hours. Do not run the engine at its maximum rated
engine speed. Also, do not expose the engine to extended periods
of high load.
12. Change the oil
and filter. Again, inspect the oil and oil filter
for any foreign particles to ensure that the engine is functioning
properly.
13. Do not use synthetic
oil for break-in. It would only be suitable to use synthetic
motor oil after the second recommended oil change and mileage
accumulation.
ZZ572620
and ZZ572/720R Component
Information Ignition System
The high energy ignition
(HEI GM part number 8896l867, included with the ZZ572/620 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 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
under hood components in vehicles not originally equipped with
HEI systems. Check for adequate clearance before installation.
The HEI distributor incorporates a hardened (melanized) drive
gear that is compatible with a cast iron 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, GM
part number 12167658, which includes connectors and wires for
the HEI’s tachometer and 12-volt terminals.
The multiple spark discharge distributor, GM part number 10093387,
included with the ZZ572/720R does not include a coil or ignition
control module. Both must be purchased separately. This distributor
requires the use of GM’s heavy duty ignition control, GM part
number 10037378, and heavy duty ignition coil, GM part number
10037380, to function properly. Follow the installation instructions
included with the ignition control and coil components.
Timing Information
For Both Engines
Set spark timing at 36° BTDC at 4000 RPM with the vacuum
advance line to the distributor disconnected and plugged. This
setting will produce 36° of total advance at wide open throttle.
The HEI vacuum advance canister should remain disconnected.
Flexplate
The ZZ572/620 has an automatic flexplate included with the engine
assembly, GM part number 12561217. If a manual transmission
is to be used, a manual flywheel, GM part number 12555135, must
be purchased separately.
The Z2572/720R does not include a flexplate with the engine
assembly due to wide variety applications and event sanctioning
body regulations. You must choose one that suits your requirements.
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, GM 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. If you have technical
questions regarding the carburetor or cannot locate the instructions,
please contact the carburetor manufacturer at (706) 864-8544.
The air cleaner size should be at least 14.0” in diameter and
4.0” tall or with equivalent surface area to allow adequate
air flow to the engine.
Exhaust Header
Information
The engines were developed using 2.25” diameter x 36” long primary
tube headers with 3.50” diameter collectors.
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