Idiomas disponibles
Idiomas disponibles
PERFORMANCE
GM
PARTS
Start-up and Break-in Procedures
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. Follow the instructions enclosed with the tool. To prime
the engine, first remove the distributor to allow access to the oil pump drive shaft. Note the position of the
distributor before removal. Install the oil priming tool, GM part number 12368084. Using a 1/2" dill motor,
rotate the engine oil priming tool clockwise for three minutes. While you are priming the engine, have some-
one else rotate the crankshaft clockwise to supply oil throughout the engine and to all the bearing surfaces
before the engine is initially started. 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. Reinstall the distributor in the
same orientation as it was removed.
After the engine has been installed in the vehicle, recheck the oil level and add oil as required. It is also good
practice to always recheck the ignition timing after removal and reinstallation of the distributor. See step 4 or
engine specifications for the proper timing 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. If using the deluxe engine configuration, set the ignition timing
to 15° 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° at 4000 RPM if using the deluxe engine configu-
ration.
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 back to idle (0% throttle) in gear.
9. Run two or three hard throttle (WOT 100%) accelerations to about 5000 RPM and back to idle (0% throttle) in
gear.
10. Change the oil and filter. Replace with 20w50 racing motor oil (non 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 maxi-
mum 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 be suitable to use synthetic motor oil after the second recom-
mended oil change and mileage accumulation. In colder regions, a lower viscosity oil may be required for
better flow characteristics.
ZZ572/620 and ZZ572/720R Short Block Specifications REV 15JA08
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.
88962927
PART NO.
DATE
REVISION
GENERAL MOTORS
SERVICE PARTS OPERATIONS
6200 Grand Pointe Drive, Grand Blanc, MI 48439
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