150 cu in Four-Cylinder
and
All In-Line Six-Cylinder Engines

Four-Cylinder	Six-Cylinder
Engine Block	Engine Block
Pistons and Rings	Pistons and Rings
Crankshaft and Flywheel	Crankshaft and Flywheel
Cylinder Head and Valve Train	Cylinder Head and Valve Train
Oil Pump	Oil Pump
Oversize & Undersize Code Letter Definition	Oversize & Undersize Code Letter Definition

General
Displacement
	Six-Cylinder	232 or 258 cu in
	Four-Cylinder	150 cu in
Bore and Stroke
	150 cu in engine	3.876 x 3.188 in
	232 cu in engine	3.750 x 3.5 in
	258 cu in engine	3.750 x 3.895 in
Oil Pressure
	600 rpm	13 psi
	Above 1600 rpm	37 to 75 psi
Firing Order
	Four-Cylinder	1-3-4-2
	Six-Cylinder	1-5-3-6-2-4

Four-Cylinder Engine

Engine Block
Cylinder Bore
	Diameter	3.8751 to 3.8755 in
	Taper Limit	0.001 in
	Out-of-Round Limit	0.001 in
Deck Warpage Limit		0.002 in over 6 in

Pistons and Rings
Piston-to-Bore Clearance
	Standard		0.0009 to 0.0017 in
	Preferred		0.0012 to 0.0013 in
Piston Ring Side Clearance
	Compression
		Standard	0.0017 to 0.0032 in
		Preferred	0.0017 in
	Oil Control
		Standard	0.001 to 00008 in
		Preferred	0.003 in
Piston Ring End Gap
	Compression		0.010 to 0.02 in
	Oil Control		0.010 to 0.025 in

Crankshaft
Main Journal
	Diameter	2.4996 to 2.5001 in
	Taper Limit	0.0005 in
	Out of Round Limit	0.0005 in
Main Bearing Oil Clearance
	Standard	0.001 to 0.0025 in
	Preferred	0.002 in
Connecting Rod Journal
	Diameter	2.0934 to 2.0955 in
	Taper Limit	0.0005 in
	Out-of-Round	0.0005 in
Connecting Rod Bearing Oil Clearance
	Standard	0.001 to 0.003 in
	Preferred	0.0015 to 0.002 in
Connecting Rod End Play		0.010 to 0.0019 in
Crankshaft End Play		0.0015 to 0.0065 in

Camshaft
Bearing Journal Diameter
	Number 1	2.029 to 2.030 in
	Number 2	2.019 to 2.020 in
	Number 3	2.009 to 2.010 in
	Number 4	1.999 to 2.000 in
Bearing Oil Clearance		0.001 to 0.003 in
Lobe Lift		0.265 in
End Play		Zero (engine operating)

Cylinder Head and Valve Train
Head Warpage Limit		0.002 in over 6 in
Intake Valve Seat Angle		44.5º
Exhaust Valve Seat Angle		44.5º
Intake Valve Seat Width		0.040 to 0.060 in
Valve Seat Runout Limit		0.0025 in
Valve Guide Inside Diameter		0.313 to 0.314 in
Intake Valve Face Angle		44º
Exhaust Valve Face Angle		44º
Valve Margin Width		1/32 in minimum
Valve Stem Diameter		0.311 to 0.312 in
Valve Stem-to-Guide Clearance		0.001 to 0.003 in
Valve Spring Free Length		1.82 in
Lifter/Tappet Type		Hydraulic
Valve Lash Adjustment		Zero
Lifter Bore Diameter		0.9055 to 0.9065 in
Lifter Diameter		0.904 to 0.9045 in
Lifter-to-Bore Clearance		0.001 to 0.0025 in
Pushrod Diameter		0.312 to 0.315 in
Pushrod Length		9.640 to 9.660 in

Oversize and Undersize Component Code Letter Definition
Code Letter
	B	All cylinder bores	0.010 in oversize
	M	All crankshaft main bearing journals	0.010 in undersize
	P	All connecting rod bearing journals	0.010 in undersize
	C	All camshaft bearing bores	0.010 in oversize

Six-Cylinder Engine

Engine Block
Cylinder Bore
	Diameter		3.7501 to 3.7533 in
	Taper Limit
		1972 through 1981	0.005 in
		1982 and later	0.001 in
	Out-of-Round Limit
		1972 through1981	0.003 in
		1982 and later	0.001 in
Deck Warpage Limit			0.006 in max.

Pistons and Rings
Piston-to-Cylinder
	Standard		0.0009 to 0.0017 in
	Preferred		0.0012 to 0.0013 in
Piston Ring Side Clearance
	1972 through 1980
		Compression (standard)	0.0015 to 0.003 in
		Compression (preferred)	0.0015 in
		Oil Control (standard)	0.001 to 0.008 in
		Oil Control (preferred)	0.003 in
	1981 and Later
		Compression (standard)	0.0017 to 0.0032 in
		Compression (preferred)	0.0017 in
		Oil Control (standard)	0.001 to 0.008 in
		Oil Control (preferred)	0.003 in
Piston Ring End Gap
	Compression (all)		0.010 to 0.020 in
	Oil Control
		1972 and 1973 only	0.015 to 0.055 in
		All others	0.010 to 0.025 in
	Piston Pin Diameter		0.9304 to 0.9309 in
Piston Pin-to-Piston Clearance
	Standard		0.0003 to 0.0005 in
	Preferred		0.0005 in

Crankshaft
Main Journal
	Diameter
		1972 through 1981	2.4986 to 2.5001 in
		1982 and Later	2.4996 to 2.5001 in
	Taper Limit		0.0005 in
	Out-of-Round Limit		0.0005 in
Main Bearing Oil Clearance
	1972 and 1973		0.001 to 0.002 in
	1974 through 1980
		Standard	0.001 to 0.003 in
		Preferred	0.0025 in
	1981 and Later
		Standard	0.001 to 0.0025 in
		Preferred	0.002 in
Connecting Rod Journal
	Diameter		2.0934 to 2.0955 in
	Taper Limit		0.005 in
	Out-of-Round		0.0005 in
Connecting Rod Bearing Oil Clearance
	1972 and 1973		0.001 to 0.002 in
	1974 and 1975
		Standard	0.001 to 0.003 in
		Preferred	0.0025 in
	1976 through 1980
		Standard	0.001 to 0.0025 in
		Preferred	0.0015 to 0.002 in
	1981 and Later
		Standard	0.001 to 0.003 in
		Preferred	0.0015 to 0.002 in
Connecting Rod End Play
	1972		0.008 to 0.010 in
	1973 through 1980		0.005 to 0.014 in
	1981 and Later		0.010 to 0.019 in
Crankshaft End Play			0.0015 to 0.0065 in

Camshaft
Bearing Journal Diameter
	Number 1		2.029 to 2.030 in
	Number 2		2.019 to 2.020 in
	Number 3		2.009 to 2.010 in
	Number 4		1.999 to 2.000 in
Bearing Oil Clearance			0.001 to 0.003 in
Lobe Lift
	1972 through 1974		0.254 in
	1975 and 1976		0.232 in
	1977 through 1979
		232/258 with 1 bbl. carb	0.232 in
		258 with 2 bbl.carb	0.248 in
	1980		0.248 in
	1981 and later		0.253 in
End Play			Zero (engine operating)

Cylinder Head and Valve Train
Head Warpage Limit			0.006 in max.
Intake Valve Seat Angle			30º
Exhaust Valve Seat Angle			44.5º
Intake Valve Seat Width			0.040 to 0.060 in
Exhaust Valve Seat Width			0.040 to 0.060 in
Valve Seat Runout Limit			0.0025 in
Valve Guide Inside Diameter			0.3735 to 0.3745 in
Intake Valve Face Angle			29º
Exhaust Valve Face Angle			44º
Valve Margin Width			1.32 in min.
Valve Stem Diameter			0.3715 ti 0.3725 in
Valve Stem-to-guide Clearance			0.001 to 0.003 in
Valve Spring Free Length
	1972 and 1973		Not available
	1974 through 1976
		With Rotators	2.00 in (approx.)
		Without Rotators	2.234 in (approx.)
	1977
		258 2 bbl. only	1.987 in (approx.)
		All others	2.234 in (approx.)
	1978 and Later		1.99 in (approx.)
Lifter/Tappet Type			Hydraulic
Valve Lash Adjustment			Zero
Lifter Bore Diameter
	1972 and 1973		Not available
	1974 throug 1980		0.905 to 0.906 in
	1981 and Later		0.9055 to 09.065 in
Lifter Diameter
	1972 and 1973		Not available
	1974 through 1983		0.904 to 0.9045 in
Lifter-to-Bore Clearance
	1972 and 1973		Not available
	1974 through 1980		0.001 to 0.002 in
	1981 and Later		0.001 to 0.0025 in
Pushrod Diameter
	1972, 1973 and 1975		Not available
	1974		0.294 to 0.303 in
	1976 through 1980		0.12 to 0.313 in
	1981 and Later		0.312 to 0.315 in
Pushrod Length
	1972, 1973 and 1975		Not available
	1974		9.656 to 9.666 in
	1976		9.595 to 9.615 in
	1977 through 1980		9.640 to 9.660 in
	1981 and Later		9.710 to 9.730 in

Oil Pump
Gear-to-Body Clearance
	1972 through 1980	0.0005 to 0.0025 in
	1981 and Later	0.002 to 0.004 in
Gear End Clearance
	1972 through 1976 and 1981 through 1986	0.002 to 0.006 in
	1977 through 1980	0.002 to 0.008 in

Oversize and Undersize Component Code Letter Definition
Code Letter
	B	All Cylinder Bores	0.010 in oversize
	M	All Crankshaft Main Bearing Journals	0.010 in undersize
	P	All Connecting Rod Bearing Journals	0.010 in undersize
	C	All Camshaft Bearing Bores	0.010 in oversize

All Models

Torque Specifications		FT-Lbs
Camshaft Sprocket Bolts		45 to 55
Carburetor Mounting Nuts		12 to 15
Connecting Rod Cap Nuts		33
Cylinder Head Bolts
	1972	80 to 85
	1973 through 1980	105
	1981 and Later	85
Crankshaft Pulley-to-Damper Bolts		20 to 25
Exhaust Manifold Bolts		20 to 25
Fan and Hub Assembly Bolts		15 to 25
Driveplate-to-Torque Converter Bolts		20 to 25
Flywheel/Driveplate-to-Crankshaft Bolts		100 to 110
Intake Manifold Bolts		20 to 25
Main Bearing Cap Bolts		80
Oil Pump Cover Bolts		6
Oil Pump Mounting Bolts
	Short	8 to 12
	Long	15 to 18
Oil Pan Bolts
	1/4 x 20	5 to 9
	5/16 x 18	10 to 13
Bridged Rocker Pivot Bolts		19
Rocker Arm Shaft Bolts		21
Vibration Damper Bolts
	1972 through 1976	50 to 60
	1977 and Later	80
Water Pump Bolts		10 to 15