Buick LeSabre 1965 Service Manual page 28

2 - 6 SPECIFICATIONS
ENGINE
a. 401 and 425 Cubic Inch Engines (Cont'd.)
Item
401 Cu. In.
425 Cu. In.
Cylinder Bores - Standard Size 4.1875 4.312
Piston Pin Diameter 9994 - .9997 .9994 - .9997
Piston Pin Length 3.520 3.520
Piston Pin Fit (In Connecting Rod) Press Press
Piston Ring Gap - Compression Ring in Bore .015 - .025 .015 - .025
Piston Ring Gap - Oil Ring in Bore .015 - .035 .015 - .055
Camshaft Bearing Journal Dia.
#1 1.785 - 1.786 1.785 - 1.786
#2 1.755 - 1.756 1.755 - 1.756
#3 1.725 - 1.726 1.725 - 1.726
#4 1.695 - 1.696 1.695 - 1.696
#5 1.665 - 1.666 1.665 - 1.666
Valve Lifter Diameter .8425 .8425
Valve Lifter Clearance in Crankcase .0015 - .0030 .0015 - .0030
Rocker Arm Ratio 1.6:1 1.6:1
Rocker Arm Clearance on Shaft .0027 - .0042 .0027 - .0042
Valve Head Diameter - Inlet 1.875 1.875
Valve Seat Angle - Inlet 45° 45°
Valve Stem Diameter - Inlet .373T - .372B .373T - .372B
Valve Head Diameter - Exhaust 1.500 1.500
Valve Seat Angle - Exhaust 45° 45°
Valve Stem Diamter - Exhaust 372T - .3715B .372T - .3715B
Valve Stem Clearance in Guide
Inlet .001 - .003 Top, .002 - .004 Bottom Same as 401
Exhaust .0015 - .0035 Top, .0025 - .0045 Bottom Same as 401
Valve Spring - Outer
Valve Closed (Lbs. @ Length) 46 @ 1.600" 46 @ 1.60CT
1
Valve Open (Lbs. @ Length) 101 @ 1.160" 101 @ 1.160"
Valve Spring - Inner
Valve Closed (Lbs. @ Length) 25.5 @ 1.690" 25.5 @ 1.690"
Valve Open (Lbs. @ Length) 76 @ 1.250" 76 @ 1.250"
Note: All Measurements in Inches Unless Otherwise Specified.
b. 300 Cubic Inch Engines
Item
300 Cu. In.
Piston Clearance Limits
Top Land 0215 - .0295
Skirt - Top 0005 - .0011
Skirt - Bottom 0005 - .0021
Ring Groove Depth
#1 - Compression Ring 1880 - .1955
#2 - Compression Ring 1905 - .1980
#3 - Oil Ring 1905 - .1980
Ring Width
#1 - Compression Ring 0785 - .0790
#2 - Compression Ring 0770 - .0780
#3 - Oil Ring 181 - .187
Ring Gap
#1 - Compression Ring 010 - .020
#2 - Compression Ring 010 - .020
#3 - Oil Ring 015 - .035
Piston Pin Length 3.060
Diameter of Pin 9394 - .9397
Clearance
In Piston 00005 - .0001
In Rod 0007 - .0015 Press
Direction & Amount Offset In Piston 040 Toward High Thrust Side
*A11 Measurements In Inches Unless Otherwise Specified.