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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 an engine priming tool that is not included with the engine. Tool is available from a variety of sources. 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. 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. 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 3000 RPM and back to idle (0% throttle) in gear.
9.
Run two or three hard throttle (WOT 100%) accelerations to about 3000 RPM and back to idle (0% throttle) in gear.
10. Change the oil and filter. Replace with 10w30 motor oil (non synthetic) and a PF454 or PF1218 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 be suitable to use synthetic motor oil after the second recommended oil change and mileage accumulation.
In colder regions, a lower viscosity oil may be required for better flow characteristics.
350/265 HP Engine Specifications
Displacement.....................................................................................
Bore x Stroke.....................................................................................
Compression......................................................................................
Block...................................................................................................
Cylinder Head....................................................................................
Valve Diameter (Intake/Exhaust)............................................
Chamber Volume..............................................................................
Crankshaft..........................................................................................
Connecting Rods...............................................................................
Pistons................................................................................................
Rings...................................................................................................
Camshaft............................................................................................
Lift:...............................................................................................
Duration......................................................................................
Centerline...................................................................................
Rocker Arm Ratio..............................................................................
Timing Chain......................................................................................
350/265 HP Engine Long Block Specifications
ALL INFORMATION WITHIN ABOVE
Date
BORDER TO BE PRINTED EXACTLY
AS SHOWN ON 8.5 x 11 WHITE 16
POUND NON-BOND RECYCLABLE
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
04OC17
UNITIZED IN ACCORDANCE WITH
17JN20
GMCCA SPECIFICATIONS.
350 cubic inches
4.00 inch x 3.48 inch
8.1 nominal
Cast iron, four-bolt intermediate mains
Cast iron
1.94"/1.50"
76cc
Nodular iron, 2 piece rear seal
Forged, powdered metal, 38" bolts
Cast aluminum
Cast iron
Hydraulic flat tappet
.385" intake, 403" exhaust
194° intake, 202° exhaust @ .050" tappet lift
108° ATDC intake, 116° BTDC exhaust
1.5:1
8 mm single roller design
REV 17JN20
Revision
Auth
Previous Revisions are
Archived
Revision Rusty Sampsel
N/A
Revision Alin Dragoiu
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PART No.
19240527
DR
Installation Instructions
Title
350/265 HP Engine Long Block Specifications
19240527
PART No.
SHEET
3 of 22
SHEET 3 of 22
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