V8 Engine

General Cylinder Bore
Engine Block Pistons and Rings
Crankshaft and Flywheel Camshaft
Cylinder Head and Valve Train Oil Pump
Oversize & Undersize Component Code Letter Definition Torque Specifications

Displacement304 cu in
Cylinder Numbering(viewed from radiator, front-to-rear)
Left Bank1-3-5-7
Right Bank2-4-6-8
Firing Order1-8-4-3-6-5-7-2
Compression Pressure140 psi
Maximum Variation Between Cylinders20 psi
Oil Pressure
600 rpm13 psi
1600 rpm and above37 psi minimum
75psi max.

Cylinder Bore
Taper Limit0.005 in
Out-of-Round Limit0.003 in
Deck Warpage Limit0.008 in

Pistons and Rings
Piston-to-Cylinder Bore Clearance
Standard0.0010 to 0.0018 in
Preferred0.0014 in
Piston Ring Side Clearance
Top Ring
Standard0.0015 to 0.0035 in
Preferred0.0015 in
2nd Ring
Standard0.0015 to 0.003 in
Preferred0.0015 in
Oil Ring0.010 to 0.025 in
Piston Ring End Gap
Standard0.010 to 0.020 in
Preferred0.010 to 0.012 in
Oil Ring0.010 to 0.025 in
Piston Pin-to-Rod ClearancePress fit
Piston Pin-to-Bore Clearance
Standard0.0003 to 0.0005 in
Preferred0.0005 in

Crankshaft and Flywheel
Main Journal Diameter
1, 2, 3 and 42.7474 to 2.7489 in
Rear Main (5)2.7464 to 2.7479 in
Main Bearing Oil Clearance
1, 2, 3 and 4
Standard0.001 to 0.003 in
Preferred0.0017 to 0.0020 in
Rear Main (5)
Standard0.002 to 0.004 in
Preferred0.0025 to 0.003 in
Connecting Rod Journal
Diameter2.0934 to 2.0955 in
Taper Limit0.0005 in
Out-of-Round0.0005 in
Connecting Rod Bearing Oil Clearance
Standard0.001 to 0.003 in
Preferred0.0020 to 0.0025 in
Connecting Rod End Play0.006 to 0.0018 in
Crankshaft End Play0.003 to 0.008 in

Bearing Journal Diameter
Number 12.1195 to 2.1205 in
Number 22.0895 to 2.0905 in
Number 32.0595 to 2.0605 in
Number 42.0295 to 2.0305 in
Number 51.9995 to 2.0005 in
Bearing Oil Clearance
Standard0.001 to 0.003 in
Preferred0.0017 to 0.0020 in
Lobe Lift0.266 in
End PlayZero
Timing Chain Total Allowable Deflection7/8 in

Cylinder Head and Valve Train
Head Warpage Limit0.008 in max.
Intake Valve Seat Angle30
Exhaust Valve Seat Angle44.5
Intake Valve Seat Width0.040 to 0.060 in
Valve Seat Runout Limit0.0025 in max.
Intake Valve Face Angle29
Exhaust Valve Face Angle44
Valve Stem Diameter0.3715 to 0.3725 in
Valve Guide Diameter0.3735 to 0.3745 in
Valve Stem-to-Guide Clearance0.001 to 0.003 in
Valve Margin Width1/32 in minimum
Valve Lifter TypeHydraulic
Lifter Diameter0.9040 to 0.9045 in
Lifter Bore Diameter0.9055 to 0.9065 in
Lifter-to-Bore Clearance0.001 to 0.0025 in

Oil Pump
Gear End Clearance0.002 to 0.006 in
Gear-to-Body Clearance0.005 to 0.0025 in
Oil Pressure Relief Valve Opening Pressure75 psi

Oversize and Undersize Component Code Letter Definition
Code Letter
BCylinder bore0.010 in oversize
MMain bearing0.010 in undersize
FConnecting rod bearing0.010 in undersize
PMMaind and connecting rod bearing0.010 in undersize
CCamshaft bearing bores0.010 in oversize

Torque Specifications FT-LbsNm
Camshaft Gear Screw3041
Carburetor Adapter12 to 1516 to 20
Carburetor Mounting Nuts12 to 1516 to 20
Connecting Rod Nuts
1972 through 19752838
1976 through 19833345
Crankshaft Pulley-to-Damper Bolts17 to 2824 to 38
Cylinder Head Bolts110149
Driveplate-to-Torque Converter Bolts2230
Exhaust Manifold Bolts
3/8 in2534
5/16 in1520
Exhaust Pipe-to-Manifold Bolts15 to 2520 to 34
Fan and Hub Assembly12 to 2516 to 34
Flywheel/Driveplate-to-Crankshaft Bolts105142
Intake Manifold4358
Main Bearing Cap Bolts100136
Oil Pan Screws
1/4 in5 to 97 to 12
5/16 in9 to 1312 to 18
Oil Pump Cover4.56.0
Oil Relief Valve Cap2838
Rocker Arm Bolt16 to 2622 to 35
Spark Plugs22 to 3330 to 45
Starter Motor Bolts13 to 2518 to 34
Thermostat Housing Bolts10 to 1814 to 24
Timing Chain Cover-to-Block Bolts18 to 3324 to 45
Vibration Damper Bolts*
1972 through 19755576
1976 and 197880108
1977 and 1979 through 198390122
Water Pump Bolts 4 to 55 to 6

*Note:The vibration damper bolt on 1978 through 1983 models should be lubricated before installation.