151 cu in Four-Cylinder Engine

General
Displacement	151 cu in
Bore and Stroke	4.0 x 3.0 in
Compression Ratio	8.24 : 1
Oil Pressure	36 to 41 psi at 2000 rpm

Cylinder Bores
Taper Limit
	1980	0.0005 in max.
	1981 through 1983	0.002 in max.
Out-of Round Limit
	1980	0.0005 in max.
	1981 through 1983	0.0015 in max.

Pistons and Rings
Piston Diameter		3.9968 to 3.992 in
Piston-to-Cylinder Bore Clearance
	Top	0.0025 to 0.0033 in
	Bottom	0.0017 to 0.0041
Piston Ring Side Clearance		0.0030 in
Piston Ring End Gap
	Top ring	0.010 to 0.022 in
	2nd ring	0.010 to 0.028 in
	Oil ring side rails	0.015 to 0.055 in
Piston Pin Diameter		0.92705 to 0.92745 in
Piston Pin-to-Piston Clearance
	Standard	0.0003 in
	Service Limit	0.0005 in
Piston Pin-to-Connecting Rod Clearance		Press fit

Crankshaft and Connecting Rods
Main Journal
	Diameter	2.2988 in
	Taper Limit	0.0005 in max.
	Out-of-Round Limit	0.0005 in max.
Main Bearing Oil Clearance
	Standard	0.0005 in
	Service Limit	0.0022 in
Connecting Rod Journal
	Diameter	2.000 in
	Taper Limit	0.0005 in max.
	Out-of-Round Limit	0.0005 in max.
Connecting Rod Bearing Oil Clearance
	Standard	0.0005 in
	Service Limit	0.0026 in
Connecting Rod End Play		0.017 in
Crankshaft End Play		0.0035 to 0.0085 in

Camshaft
Bearing Journal Diameter		1.869 in
Bearing Oil Clearance
	Standard	0.0007 in
	Service Limit	0.0027 in
Lobe Lift		0.230 in
End Play		0.0015 to 0.0050 in

Cylinder Head and Valve Train
Cylinder Head Warpage Limit		0.008 in max.
Valve Seat Angle		46º
Valve Seat Width
	Intake	0.0353 to 0.0747 in
	Exhaust	0.058 to 0.097 in
Valve Face Angle		45º
Valve Margin Minimum Width		1/32 in
Valve Stem-to-Guide Clearance
	Standard
		1982 and 1983 exhaust only	0.020in
		All others	0.010 in
	Service Limit	0.0027 in
Valve Spring Pressure	(lbs at specified length)
	Closed	78 to 86 at 1.66 in
	Open	172 to 180 at 1.254 in
Valve Lash Adjustment		Zero
Lifter Leakdown Rate		12 to 90 seconds with a 50-lb load
Lifter Diameter		0.8120 to 0.8427 in
Lifter Bore Diameter		0.8435 to 0.8445 in
Lifter-to-Bore Clearance		0.0025 in
Pushrod Length		8.927 in

Torque Specifications		Ft-lb	Nm
Adapter-to-Intake Manifold		10 to 16	14 to 20
Camshaft Thrust Plate-to-Block Screws		4.4 to 9	6 to 12
Carburetor-to-Manifold Nuts		10 to 16	14 to 20
Connecting Rod Nuts		30	40
Crankshaft Pulley Hub Bolts		157 to 163	217 to 223
Cylinder Head Bolts		92	125
Distributor Clamp Bolt		6 to 12	9 to 15
Distributor Clamp Pivot Bolt		9 to 15	14 to 21
Driveplate-to-Crankshaft Bolts		42 to 48	57 to 63
Driveplate-to-Converter Bolts		40	54
EGR Valve-to-Manifold		6.6 to 11	9 to 15
Exhaust Manifold Bolts		36 to 42	47 to 53
Exhaust Pipe-to-Manifold Nuts		34 to 40	49 to 55
Fan and Pulley-to-Water Pump		15 to 21	21 to 27
Flywheel-to-Crankshaft Bolts		65 to 71	90 to 96
Fuel Pump-to-Block		12 to 18	17 to 23
Intake Manifold		34 to 40	17 to 53
Main Bearing Cap Bolts		65	88
Oil Filter Adapter-to-Block		32 to 38	44 to 50
Oil Pan Drain Plug		23 to 28	31 to 37
Oil Pan Bolts		4 to 7	6 to 11
Oil Pump Cover Bolts		6 to 12	14 to 20
Oil Pump-to-Block Bolts		15 to 21	22 to 28
Oil Pump-to-Driveshaft Plate		7 to 3	11 to 17
Oil Screen Support Nut		25 to 31	35 to 41
Air Injection Bracket		34 to 40	47 to 54
Pressure Plate-to-Flywheel Bolts		15 to 22	20 to 30
Crankshaft Pulley Bolt		22 to 28	31 to 37
Pushrod Cover Bolts		4.4 to 9	6 to 12
Rocker Arm Cover Bolts		4 to 10	7 to 13
Rocker Arm Stud		57 to 63	73 to 79
Rocker Arm-to-Stud nuts		17 to 23	24 to 30
Starter Bolts		14 to 20	21 to 27
Thermostat Housing Bolts		19 to 25	27 to 33
Timing Cover		5	2 to 8
Timing Cover-to-Block		9	6 to 12
Water Outlet Housing		14 to 20	20 to 26
Water Pump		14 to 20	20 to 26