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351W - Engine Specifications

GENERAL SPECIFICATIONS
Bore and Stroke Compression Pressure psi. (Sea Level) @ Cranking Oil Pressure - Hot @ 2000 RPM Firing Order Size Drive Belt Tensions (lbs.) (5)
Newly Installed Used
Up to 10 Min. Over 10 Min.
4.00 x 3.50 The lowest reading must be within 75% of the highest 40-65 1-3-7-2-6-5-4-8 Exc. 1/4" 120-160 90-160 (3) 75-120 (4)
(1) Read tension immediately after belt is installed, before it stretches or seats in pulley grooves.
(2) If less than 40 pounds, readjust to 40-60 pounds. (4) If less than 75 pounds, readjust to 90-120 pounds.
(3)If less than 90 pounds, readjust to 90-120 pounds. (5)A used belt is any in operation for 10 minutes.

 

CYLINDER HEAD
Combustion Chamber Volume Valve Guide Bore Diameter (Std Intake & Exhaust) Valve Seat Width Valve Seat Angle Valve Seat Runout (Max) Valve Arrangement (Front to Rear) Rocker Arm Stud Bore Dia. Std. Gasket Surface Flatness
Intake Exhaust
58.9-61.9 0.3433-0.3443 0.060-0.080 0.060-0.090 45° 0.0020 Right I-E-I-E-I-E-I-E
Left E-I-E-I-E-I-E-I		 0.3680-0.3695 0.003" In Any 6 Inches. 0.006" Overall
1 Head Gasket Surface Finish R.M.S. 60-150

 

VALVE ROCKER ARMS, PUSH RODS, AND TAPPETS
Rocker Arm Lift Ratio Valve Push Rod (Max. Runout) Valve Tappet Or Lifter Collapsed Tappet Gap
Standard Diameter Clearance To Bore  (1) Hydraulic Lifter Leakdown Rate
1.61:1 0.015 0.8740-0.8745 0.0007-0.0027 5-50 seconds Max -- Measured at 1/16" plunger travel Allowable Desired
0.106-0.206 0.131-0.181
(1) Wear Limit -- 0.005

 

VALVE SPRINGS
Valve Spring Pressure
lbs. @ Specified Length		 Valve Spring Free Length Approx. Valve Spring Assembled Height Pad to Retainer Valve Spring Out-of-Square (Max.)
Pressure Wear Limit
71-79 @ 1.790
190-210 @1.340		 10% Pressure Loss @ Specified Length 2.06 1-49/64 - 1-13/16 5/64 (0.078)

 

VALVES
Valve Stem Guide Clearance (1) Valve Head Diameter Valve Face Angle (2)
Intake Exhaust Intake Exhaust
0.0010-0.0027 0.0015 1.773-1.791 1.441-1.460 44°
(1) Wear Limit 0.005 (2) Valve Face Runout -- Max. 0.002
Lobe Lift (1) Theoretical Valve Lift Camshaft Camshaft Journal to Bearing Clearance Timing Chair Deflection (Max.)
Intake Exhaust Intake Exhaust End Play (2) Clearance (3)
0.2600 0.2780 0.4180 0.4480 0.001-0.007 0.001-0.003 0.005
(1) Max. allowable lobe lift loss (all engines) -- 0.005 (2) Wear limit -- 0.009 (3) Wear Limit -- 0.006
Valve Stem Diameter
Standard 0.003 Oversize 0.015 Oversize 0.030 Oversize
Intake Exhaust Intake Exhaust Intake Exhaust Intake Exhaust
0.3416-
0.3423		 0.3411-
0.3418		 0.3446-
0.3453		 0.3441-
0.3448		 0.3566-
0.3573		 0.3561-
0.3568		 0.3716-
0.3723		 0.3711-
0.3718

 

CAMSHAFT
Item Bearing 351-W Item Bearing 351-W
Camshaft Journal Diameter -- Standard (1) (No 1) 2.0805-2.0815 Camshaft Bearings Inside Diameter (No 1) 2.0825-2.0835
(No 2) 2.0655-2.0665 (No 2) 2.0675-2.0685
(No 3) 2.0505-2.0515 (No 3) 2.0525-2.0535
(No 4) 2.0355-2.0365 (No 4) 2.0375-2.0385
(No 5) 2.0205-2.0215 (No 5) 2.0225-2.0235
Camshaft Bearing Location (2) (No 1) 0.0050-0.0200  
(1) Camshaft journal Maximum Runout -- 0.005
      Camshaft journal Maximum out-of-bound -- 0.0005		 (2) Distance in inches that the front edge of the bearing is installed towards the rear from the front face of the cylinder block.

 

CYLINDER BLOCK
Cylinder Bore Diameter (1) (3) Lifter Bore Diameter Main Bearing Bore Diameter Cylinder Block Distributor Shaft Bearing Bore Diameter Head Gasket Surface Flatness (2) Crankshaft To Rear Face of Block Runout TIR max.
4.0000-4.0048 0.8752-0.8767 3.1922-3.1930 0.5155-0.5171 0.003" in any 6 inches or 0.006" overall 0.010
(1) Maximum out-of-round -- 0.0015
Wear Limit -- 0.005
Cylinder Bore Surface Finish RMS -- 18-38
(2) Head Gasket Surface Finish RMS -- 60-150
(3) Maximum Taper -- 0.001
Wear Limit -- 0.010

 

CRANKSHAFT AND FLYWHEEL
Main Bearing Journal Diameter (1) Main Bearing Journal Runout (2) Main Bearing Journal Thrust Face Runout Main Bearing Journal Taper Max. Thrust Bearing Journal Length Main Bearing Surface Finish RMS Max.
Journal Thrust Face
2.9994-3.0002 0.002 0.001 0.0006 per Inch 1.137-1.139 12 35 Front
25 Rear
(1) Main bearing journal out-of-round maximum 0.0004 (all engines) (2) Wear Limit -- 0.005
Connecting Rod Journal Diameter (2) Connecting Rod Bearing Journal Maximum Taper Crankshaft Free End Play (1) Flywheel Ring Gear Lateral Runout Automatic Transmission
2.3103-2.3111 0.0006 per Inch 0.004-0.008 0.060
(1) Wear Limit -- 0.012 (2) Connecting Rod journal out-of-round maximum -- 0.0006 (all engines)

 

OIL PUMP
Rotor-Type Oil Pump Relief Valve Spring Tension
lbs. @ Specified Length		 Drive Shaft to Housing Bearing Clearance Relief Valve Clearance Rotor Assembly End Clearance Outer Race to Housing
(Radial Clearance)
18.2-20.2 @ 2.49 0.0015-0.0029 0.0015-0.0029 0.001-0.004 0.001-0.013

 

CRANKSHAFT BEARINGS
Connecting Rod Bearings Main Bearings
To Crankshaft Clearance Wall Thickness Standard (1) To Crankshaft Clearance Wall Thickness Standard (1)
Desired Allowable Desired Allowable
0.0008-0.0015 0.0008-0.0026 0.0572-0.0577 0.0008-0.0015 0.0008-0.0026 0.0957-0.0960
(1) 0.002 Undersize Thickness .... Add 0.0010 to Standard Thickness.

 

CONNECTING ROD
Piston Pin Bore or Bushing ID Connecting Rod Bearing Bore Diameter (1) Connecting Rod Length Center to Center Connecting Rod Alignment Maximum Total Difference (2) Connecting Rod Assembly (Assembled to Crankshaft)
Twist Bend Side Clearance Wear Limit
0.9104-0.9112 2.2390-2.2398 5.9545-5.9575 0.024 0.012 0.010-0.020 0.023
(1) Connecting rod bearing bore maximum out-of-round and taper (all engines) --0.0004 (2) Pin bushing and crankshaft bearing bore must be parallel and in the same vertical plane within the specified total difference at ends of 8" long bar measured 4" on each side of rod.

 

PISTON
Diameter (1) Piston to Cylinder Bore Clearance Piston Pin Bore Diameter Ring Groove Width
Coded Red Coded Blue 0.003 Oversize Coded Yellow Upper Compression Ring Lower Compression Ring Oil Ring
3.9978-3.9984 3.9990-3.9996 4.0002-4.0008 4.0014-4.0020 0.0018-0.0026 0.9124-0.9127 0.080-0.081 0.080-0.081 0.1880-0.1890
(1) Measured at the piston pin bore centerline at 90° to the pin bore.

 

PISTON PIN
Length Diameter To Piston Clearance To Connecting Rod Clearance
Standard 0.001 Oversize
3.010-3.040 0.9120-0.9123 0.9130-0.9133 0.003-0.005 Interfence Fit

 

PISTON RINGS
Ring Width Side Clearance Ring Gap Width
Compression Ring Compression Ring (1) Oil Ring Compression Ring Oil Ring (2)
Top Bottom Top Bottom Top Bottom
0.077-0.078 0.077-0.078 0.002-0.004 0.002-0.004 Snug 0.010-0.020 0.010-0.020 0.015-0.055
(1) Wear Limit -- 0.006 (2) Steel Rail

 

TORQUE LIMITS -- FT./LBS.
Item Ft./Lbs. Item Ft./Lbs.
Cylinder Head Bolts -- Step 1 95-105 Valve Rocker Arm Cover 3-5
Cylinder Head Bolts -- Step 2 105-112 Fuel Pump to Cylinder Front Cover 19-27
Oil Pan to Cylinder Block 9-11 (5/16x18)
7-9 (1/4x20)		 Rocker Arm Stud Nut 17-23 after nut contacts shoulder
Intake Manifold Bolts 23-25 Alternator Pivot Bolt 45-57
Exhaust Manifold Bolts 18-24  
Distributor Vacuum Control Valve 15-18

Miscellaneous Torque Values
Flywheel to Crankshaft 75-85 Alternator Bracket to Cylinder Block 15-20
Mail Bearing Cap Bolts 95-105 Alternator Pivot Bolt 45-57
Oil Drain Plug 15-25 Alternator Adjusting Arm to Cylinder Block 15-20
EGR Valve to Carburetor Spacer 12-18 Alternator Adjusting Arm to Alternator 24-40
Oil Inlet Tube to Oil Pump 10-15 Thermactor Pump Bracket to Cylinder Block 15-20
Oil Filter Insert to Block 20-30 Thermactor Pump Pivot Bolt 22-32
Oil Filter to Insert (Cartridge Type) With oil on gasket surface, hand tighten until gasket contacts adapter face then tighten 1/2 turn more. Thermactor Pump Adjusting Arm to Pump Body 22-32
Thermactor Pump Adjusting Arm to Cylinder Block 15-20
Thermactor Pump Pulley to Shaft 80-115 in/lbs.
Camshaft Sprocket to Camshaft 40-45 Power Steering Pump Pulley to Damper (Bolt) 35-50
Camshaft Thrust Plate to Block 9-12 Fan to Water Pump Hub (Bolt) 12-18
Vibration Damper to Crankshaft 70-90 Carburetor Mounting Nuts 12-15
Crankshaft Pulley to Vibration Damper 35-50 Carburetor Mounting Stud to Intake Manifold 15 max.
Connecting Rod Nuts 40-45 Fuel Filter to Carburetor 80-100 in/lbs.

TORQUE LIMITS FOR VARIOUS SIZE BOLTS -- FT./LBS.
CAUTION:  If any of the torque limits listed in this table disagree with any of those listed in the preceding table, the limits in the preceding table will prevail.
Size (Inches) 1/4-20 5/16-18 3/8-16 7/16-14 1/2-13 9/16-18
Torque (Ft./Lbs.) 6-9 12-18 22-32 40-55 55-80 85-120
Note: Oil threads with engine oil unless the threads require oil resistant or water resistant sealer.