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Idiomas disponibles
Pistons
New high performance hypereutectic flat top pistons featuring a special skirt coating designed to run with a piston
to cylinder wall clearance of .0010"-.0015" including the coating. These pistons were designed to take full
advantage of the deck plated and precisely honed engine block. They also feature a pressed piston pin.
Water Pump
The HT383 engine comes with a long leg style cast iron water pump.
Caution
This engine assembly needs to be filled with oil and primed. You should add the specified oil (see startup
instructions) to your new engine. Check the engine oil level on the dipstick and add accordingly.
Start-up and Break-in Procedures
1. After installing the engine, ensure the crankcase has been filled with 10w30 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, part number 141-955 from our licensed partner
factoryperformanceparts.com. Using a 1/2" dill motor, rotate the engine oil priming tool clockwise for three
minutes. While you are priming the engine, have someone 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. Install Distributor as follows: (1) Locate cylinder #1 top dead center (TDC). (2)
Rotate engine to 12 degrees before top dead center (BTDC). (3) Align Rotor with the cylinder #1 terminal on
the Distributor.
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. Set spark timing at 32 degrees before top dead center (BTDC)
at 4,000 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) when using the HEI distributor P/N 93440806. 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. Rotate the distributor counterclockwise to
advance the timing. Rotate the distributor clockwise to retard the timing.
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 32° 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 4000 RPM and back to idle (0% throttle) in gear.
9. Run two or three hard throttle (WOT 100%) accelerations to about 4000 RPM and back to idle (0% throttle)
in gear.
10. Change the oil and filter. Replace with 10w30 motor oil (non synthetic) and a PF25 AC Delco oil filter. Inspect
the oil and the oil filter for any foreign particles to ensure that the engine is functioning properly.
HT383 Crate Engine Specifications
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 GM SPECIFICATIONS.
19355751
REV 04OC17
PART NO.
DATE
06DE16
INITIAL RELEASE - JIM COVEY
04OC17
REVISION - JIM COVEY
5
SHEET
REVISION
27
OF
AUTH
N/A
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