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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.
350/290 HP Engine Specifications
Displacement: ......................................................................................350 cubic inches
Bore x Stroke: ......................................................................................4.00 inch x 3.48 inch
Compression .......................................................................................8:1 nominal
Block: ...................................................................................................Cast iron, four-bolt intermediate mains
Cylinder Head: .....................................................................................Cast iron
Valve Diameter (Intake/Exhaust):..................................................1.94"/1.50"
Chamber Volume: ................................................................................76cc
Crankshaft: ..........................................................................................Nodular iron, 2 piece rear seal
Connecting Rods: ................................................................................Forged, powdered metal, 3/8" bolts
Pistons: ................................................................................................Cast aluminum
Rings: ..................................................................................................Cast iron
Camshaft: ............................................................................................Hydraulic flat tappet
Lift: .................................................................................................450" intake, .460" exhaust
Duration: .......................................................................................222° intake, 222° exhaust @ .050" tappet lift
Centerline: .....................................................................................114° ATDC intake, 114° BTDC exhaust
Rocker Arm Ratio: ...............................................................................1.5:1
Timing Chain: ......................................................................................8 mm single roller design
Oil Pan: ................................................................................................4-quart
Oil Pressure (Normal): .........................................................................20 psi @ 2000 RPM
Recommended Oil: ..............................................................................10w30 synthetic motor oil (after break in)
Oil Filter: ..............................................................................................AC Delco part # PF454 or PF1218
Valve Lash: ..........................................................................................1/8 turn down from zero lash
Fuel:.....................................................................................................Regular unleaded - 87 (R+M/2)
Maximum Engine Speed: ....................................................................5100 RPM
Spark Plugs: ........................................................................................AC Delco part # R45TS
Spark Plug Gap ....................................................................................045"
Spark Timing:.......................................................................................32° maximum @ 3000 RPM
Firing Order: ........................................................................................1-8-4-3-6-5-7-2
Information may vary with application. All specifications listed are based on the latest production information available at the time
of printing.
350/290 HP Engine Long Block 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.
19172591
REV 21AP17
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