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RAMJET 350 Engine Specifications
Displacement: ...............................................................................350 cubic inches
Bore x Stroke: ...............................................................................4.00 inch x 3.48 inch
Compression .................................................................................9.4:1 Nominal
Block: ............................................................................................Cast iron, two-bolt main caps
Cylinder Head: ..............................................................................Cast iron, Vortec
Valve Diameter (Intake/Exhaust): ...........................................1.94"/1.50"
Chamber Volume: ...................................................................62cc
Crankshaft: ....................................................................................Cast iron, 1 piece rear seal
Connecting Rods: .........................................................................Forged, powdered metal, 3/8" bolts
Pistons: .........................................................................................Cast aluminum
Rings: .....................................................................................Top Moly, Second Iron
Camshaft: ......................................................................................Hydraulic foller tappet
Lift: ...........................................................................................460" intake, .481" exhaust
Duration: .................................................................................196° intake, 205° exhaust @ .050" tappet lift
Centerline: ..............................................................................104° ATDC intake, 109° BTDC exhaust
Rocker Arm Ratio: .........................................................................1.5:1, roller tip
Timing Chain: ................................................................................Single roller design
Oil Pan: .........................................................................................5-quart excluding oil filter
Oil Pressure (Normal): ..................................................................6 psi @ 1000 RPM
Recommended Oil: .......................................................................5w30
Oil Filter: ........................................................................................AC Delco part # PF1218
Valve Lash:....................................................................................3/4 Turn Past 0 Lash
Fuel: ..............................................................................................Premium unleaded - 92 (R+M/2)
Maximum Engine Speed: ..............................................................5600 RPM
Spark Timing: ................................................................................Initial: 12° Before Top Dead Center
Spark Plugs: ..................................................................................AC Delco part # MR43LTS
Spark Plug Gap .......................................................................0.040"
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.
Caution: Before the engine is installed in a vehicle, it needs to be filled with oil and primed. Check the engine oil level on the
dipstick and add accordingly. 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 an oil priming tool. Using a 1/2" drill motor, rotate the engine oil
prime tool clockwise for two to 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 fired. Reinstall the
distributor in the same orientation as it was removed. After the engine has been installed in the vehicle, recheck the engine
oil level and add oil as required.
Ignition Coil Installation:
The ignition coil will need to be installed. It can be attached to either the rear of the cylinder head, or the firewall of the ve-
hicle, depending on the amount of clearance for your application. Torque the ignition coil bracket bolts to 22 Nm (16 ft.lbs.).
Attach the ignition coil wire to the distributor.
Ramjet 350 Engine
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.
18 psig @ 2000 RPM
24 psig @ 4000 RPM
19417614
IR 13SE18
PART NO.
DATE
13SE18
Initial Release - Alin Dragoiu
5
SHEET
REVISION
45
OF
AUTH
N/A
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