Engine

Type	V 90º
Valve Arrangement	53º Inclined L ateral in Head
Bore	3 13/16
Stroke	3 5/8
Piston Displacement	331.1 cu. in. < /TD>
Taxable horsepower (AMA)	46.51
Compression Ratio	7.5 to 1
Maxium Brake horsepower at 4440 rpm	180 at 4000 rpm
Compression Pressure at 150 rpm ( pl ugs removed) wide open throttle	135 to 165 lb.
Maxium Variation between Cylinders ( any one engine )	15 lb.
Firing order	1-8-4-3-6-5-7-2

Cylinder Numbering

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

Engine Weights

Dry Power plant assembly	710 lb. 960 lb.

Engine Dimensions

Width ( oil filter installed ) Height ( bottom of oil pan to top of air cleaner ) Length ( back of flywheel housin g to front of FAN ) ( Length may vary between early and late castings)	32 3/8 36 1/2 36 3/4

< /TR>

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
Radial Clearance ( desired )	.00 05 to .0015
Maximum Allowable Before Reconditioning< /TH>	.0025
End Play	.002 to .007
Maximum Allowable Before Reconditioning	.010
Thrust Taken By	#3 Main Bearing< /TD>
Finish at Rear Seal Surface	Knur led
Interchangeability of Bearings	Upper and Lower #'s 1,2,4 Upper and Lower # 3 Upper and Lower not Interchangeable # 5
Bearing Sizes ( Diameter and Length)	#1- 2.5 x .875 #2- 2.5 x .875 #3- 2.5 x .870 #4- 2.5 x .875 #5- 2.5 x 1.595
Main Bearing (service) Available in St andard and the following Undersized	# 1- .001 .002 .003 .010 .012 #2- .001 .002 .003 .010 .012 #3- .001 .002 .003 .010 .012 #4- .001 .002 .003 .010 .012 #5- .001 .002 .003 .010 .012< BR>

< /TR>

Main Bearing Journals

Diameter	2.4995 to 2.5005
Maximum Allowable Out of Round	. 001
Maximum Allowable Taper	.001
Center Bearing Run-Out ( total indicator reading ) When Supported at Front and Rear Main Bearing	.002

Crankpin Journals

Diameter	2.249 to 2.250
Length	1 7/8
Maximum Allowable Out-of-Round	. 001
Maximum Allowable Taper	.001

Connecting Rods and Bearings

Type	Drop Forged I Beam
Length (center to center)	6 5/8< /TD>
Weight (less bearing)	25.2 oz.
Bearings	Steel Backed Babbitt
Diameter and Length	2 1/4 x 29/3 2
Radial Clearance Desired	.0005 t o .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	59/64 x 1 3/ 16
Interchangeability	All
Clearance	.0001 to .0004 Selecti ve

< /TR>

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
Radial Clearance	.001 to .003
Maximum Allowable Before Reconditionin g	.005
Valve Lift - Intake	.378
Valve Lift - Exhaust	.361

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 23/ 32
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
Clearance in Bore (pounds pull with . 002 x 1/2 feeler stock)	5 to 12 lb.
Land Clearance (diametrical)	.02 2
Clearance at Skirt ( 1 1/2 form Bottom)	.0005 to .0015
Weight (Standard through .060 oversize)	20.8 oz.
Piston Length (overall)	3 7/8
Ring Groove Depth (compression)	No. 1 .204 No. 2 .204 No. 3 .198
Pistons for Service	Standard, .0 05, .020, .030, .040, .060, o.s.

Piston Pins

Type	Full Floating
Diameter and Length	63/64 x 3 9/ 64
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 5/64< BR>Oil 3/16 Gap .015
Piston Ring Gaps	.010 to .020
Ring Side Clearance	Compression .0020 to .0035 Upper .0010 to .0025 Intermediate .0010 to .0025 Oil .0 010 to .003

Valves - Intake

Material	Silicon-Chromium Steel< /TD>
Head Diameter	1 13/16
Length (to top of valve face)	5. 0
Stem Diameter	.372 to .373
Stem to Guide Clearance	.001 to .003
Maximum Allowable Before Reconditionin g	.004
Distance from Top Face of Guide to Fa ce of Block	1.0
Angle of Seat	45º
Adjustment	None
Lift	.378

Valves - Exhaust

Material	Silicon-Chromium Steel< /TD>
Head Diameter	1 1/2
Length (to top of valve face)	4 29/32
Stem Diameter	.371 to .372
Stem to Guide Clearance	.002 to .004
Maximum Allowable Before Reconditionin g	.006
Distance from Top Face of Guide to Fa ce of Block	1 7/32
Angle of Seat	45º
Adjustment	None
Lift	.361

Head

Valve Springs - Outer

Number	16
Free Length	2
Load When Compressed to (valve closed)	1 11/16 - 46 to 51 lb.
Load When Compressed to (valve open)	1 5/16 - 124 to 132 lb.
Assemble with Closed Coils Toward
Valve Spring ID	.990 to 1.010

Head

Valve Springs - Inner

Number	16
Free Length	1 7/8
Load When Compressed to (valve closed)	1 9/16 - 12 to 14 lb.
Load When Compressed to (valve open)	1 3/16 - 35 to 40 lb.
Assemble with Closed Coils Toward
Valve Spring ID	.690 to .710
Valve Spring Installed Height (spring seat to retainer)	1 5/8 to 1 11/16
Recondition at	1 23/32

Cylinder Head

Number Used	2
Combustion Chamber	Hemispherical
Valve Seat Run-out (maximum)	.00 2
Valve Seat Out-of-Round	.0005
Intake Valve Seat Angle	45º ; to 45 1/2º
Seat Width (finished)	.060 to .0 85
Exhaust Valve Seat Angle	45º ; to 45 1/2º
Seat Width (finished)	.040 to .0 60
Cylinder Head Gasket (thickness)	.020

< TD>40 to 65 lb.

Engine Lubrication

Pump Type	Rotary, Full Pressure< /TD>
Capacity (qt.) - When Filter Element i s Replaced add 1 qt.	5 (12 with Torque Converter)
Pump Drive	Camshaft
Operating Pressure at 40 to 50 MPH
Pressure Drop Resulting from Clogged Filt er	15 to 20 lb.