Cylinder Numbering

From front of engine	Left Bank 1-3-5-7 Right Bank 2-4-6-8

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Crankshaft

Type	Fully Counterbalanced
Bearings	Steel Backed Babbit
Journal Diameter	2.4995 to 2.500 5
Crank Pin Diameter	2.249 to 2.25 0
Maximum Out Of Round Permissible	.001
Number Of Main Bearings	5
Diameter Clearance ( desired )	. 0005 to .0015
End Play	.002 to .007
Thrust Taken By	#3 Main Bearing< /TD>
Finish at Rear Seal Surface	Diag onal Knurled
Interchangeability of Bearings	Upper and Lower #'s 1,2,4 Upper and Lower # 3 Upper and Lower not Interchangeable # 5
Main Bearing (service) All Available i n Standard and the following Undersized	.001 .002 .003 .010 .012

Connecting Rods and Bearings

Type	Drop Forged I Beam
Length (center to center)	6.625< /TD>
Weight (less bearing)	25.2oz.
Bearings	Steel Backed Babbitt
Diameter and Length	2.2507 to 2. 2512 x 29/32
Diametral Clearance Desired	.000 5 to .0015
Maximum Allowable Before Reconditioning	.0025
Side Clearance	.006 to .014
Bearings for Service	Standard, . 001, .002, .003, .010, .012 U.S.

Connecting Rod Bushing

Type	Steel Backed Bronze
Number of Bearings	8
Diameter and Length	.9843 to .98 46 x 1 1/4
Interchangeability	All
Clearance	.0001 to .0004 Selecti ve

Camshaft

Drive	Chain
Bearings	Steel-Backed Babbitt
Number	5
Thrust Taken By	Thrust Plate
End Play	.002 to .006
Maximum Allowable Before Reconditionin g	.010
Diametral Clearance	.001 to .003
Maximum Allowable Before Reconditionin g	.005

Camshaft Bearing Journals Diameter and Length

No. 1	1.998 to 1.999 x 15/16
No. 2, 3, 4	1.998 to 1.999 x 3/4
No. 5	1.4355 to 1.4365 x 29/32

Camshaft Bearings Diameter and Length (after reaming)

No. 1	2.000 to 2.001 x 15/16
No. 2, 3, 4	2.000 to 2.001 x 13/ 16
No. 5	1.4375 to 1.4385 x 7/8

Camshaft Chain

Adjustment	None
Number of Links	68
Pitch	.375
Width	1 1/8

Tappets

Type	Hydraulic
Clearence in Block	.0005 to .001 5
Body Diameter	.9040 to .9045
Clearence Between Valve Stem and Rocke r Arm or Tappet	Dry Lash .060 to .210

Pistons

Type	Horizontal Slot with Steel Strut
Material	Aluminum Alloy Tin Coat ed
Land Clearance (diametral)	.028 to .033
Clearance at Skirt ( 1 1/2 from Bottom of Skirt)	.0005 to .0015
Weight (Standard through .060 oversize)	646 gm.
Piston Length (overall)	3.99
Ring Groove Depth	No. 1 .200 No. 2 .200 No. 3 .194
Pistons for Service	Standard, .0 05, .020, .040, .060 o.s.

Piston Pins

Type	Full Floating
Diameter and Length	.9841 to .98 43 x 3.140 to 3.150
Clearance in Piston (thumb press at 70 86; F.)	.0000 to .0005
End Play	.004 to .026
Clearance in Rod (selective)	.00 01 to .0004
Piston Pins for Service	Standard , .003, .008 o.s.
Direction Offset in Piston	Towa rd Right Side of Engine

Piston Rings

Number of Rings per Piston	3
Number of Compression Rings per Piston	2
Number of Oil Rings per Piston	1
Width of Rings	Compression .0775 to .0780 Oil .1860 to .1865
Piston Ring Gaps	.010 to .020
Ring Side Clearance	Compression Upper .002 to .0035 Intermediate .0020 to .0035 Oil .0010 to .0025

Valves - Intake

Material	Silicon-Chromium Steel< /TD>
Head Diameter	1 15/16
Length (to top of valve face)	4 23/32
Stem Diameter	.372 to .373
Stem to Guide Clearance	.001 to .003
Maximum Allowable Before Reconditionin g	.004
Angle of Seat	45º
Adjustment	None
Lift	.388

Valves - Exhaust

Material	Nitrogen Treated Mangan ese Chromium-Nickel Steel
Head Diameter	1 1/2
Length (to top of valve face)	4 3/4
Stem Diameter	.371 to .372
Stem to Guide Clearance	.002 to .004
Maximum Allowable Before Reconditionin g	.006
Angle of Seat	45º
Adjustment	None
Lift	.388

Valve Springs

Number	16
Free Length	2
Load When Compressed to (valve closed)	1 11/16 - 78 to 88 lbs.
Load When Compressed to (valve open)	1 5/16 - 170 to 184 lbs.
Valve Spring ID	1.010 to 1.030

Cylinder Head

Number Used	2
Combustion Chamber	Polyspherical
Valve Seat Run-out (maximum)	.00 2
Intake Valve Seat Angle	45º ;
Seat Width (finished)	.060 to .0 85
Exhaust Valve Seat Angle	45º ;
Seat Width (finished)	.040 to .0 60
Cylinder Head Gasket (thickness)	.027

< TD>40 to 65 lb.

Engine Lubrication

Pump Type	Rotary, Full Pressure< /TD>
Capacity (qt.) - When Filter Element i s Replaced add 1 qt.	4
Pump Drive	Camshaft
Operating Pressure at 40 to 50 MPH
Pressure Drop Resulting from Clogged Filt er	15 to 20 lb.