Engine

Type	V 90º
Valve Arrangement	53º Inclined L ateral in Head
Number of Cylinders	8
Bore	3 5/8
Stroke	3 11/32
Piston Displacement	276.1 cu. in. < /TD>
Taxable horsepower (AMA)	42.05
Compression Ratio	7.1 to 1
Maxium Brake horsepower at 4440 rpm	160
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	629 lb. 892 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 )	31 1/8 35 1/8 28 3/4

< /TR>

Crankshaft

Type	Fully Counterbalanced
Bearings	Steel Backed Babbit
Number Of Main Bearings	5
Radial Clearance ( desired ) Maximum A llowable	.0005 to .0015 .0025
End Play Maximum Allowable	.0 02 to .007 .010
Thrust Taken By	#3 Center Main B earing
Finish at Rear Seal Surface	Knur led
Bearing Sizes ( Diameter and Length)	#1- 2 3/8 x 27/32 #2- 2 3/8 x 27/32 #3- 2 3/8 x 1 3/32 #4- 2 3/8 x 27/32 #5- 2 3/8 x 1 5/16
Main Bearing (service) Available in St andard and the following Undersizes	# 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	2.3745 to 2.3755
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

< /TR>

Crankpin Journals

Diameter	2.0615 to 2.0625
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 1/16
Weight (less bearing)	647 Grams< /TD>
Bearings	Steel Backed Babbitt
Diameter and Length	2 1/16 x 27/ 32
Radial Clearance Desired Maximum Allow able	.0005 to .0015 .0025
Side Clearance	.006 to .014
Bearings for Service	Standard, . 001, .002, .003, .010, .012 undersize

Connecting Rod Bushing

Type	Steel Backed Bronze
Number of Bearings	8
Diameter and Length	59/64 x 1 3/ 16

< /TR>

Camshaft

Drive	Chain
Bearings	Steel-Backed Babbitt
Number	5
Thrust Taken By	Thrust Plate
End Play Maximum Allowable	.0 02 to .006 .010
Radial Clearance Maximum Allowable	.001 to .003 .005
Valve Lift - Intake	.361
Valve Lift - Exhaust	.361

Camshaft Bearing Journals Diameter and Length

No. 1	1.998 to 1.999 x 7/8
No. 2	1.982 to 1.983 x 3/4
No. 3	1.967 to 1.968 x 3/4
No. 4	1.951 to 1.952 x 3/4
No. 5	1.4355 to 1.4365 x 15/16

Camshaft Bearings Diameter and Length (after reaming)

No. 1	2 x 7/8
No. 2	1 63/64 x 3/4
No. 3	1 31/32 x 3/4
No. 4	1 61/64 x 3/4
No. 5	1 7/16 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 (dry)	Dry Lash .060 to .210

Pistons

Type	T-Slot with Steel Band
Material	Aluminum Alloy Tin Coat ed
Clearance in Bore (pounds pull with . 002 x 1/2 feeler stock)	5 to 12 lb.
Land Clearance	.020 - .025
Clearance (Top of Skirt)	.001 to .002
Weight (Standard through .060 oversize)	518 - 522 Grams
Piston Length (overall)	3 27/64< /TD>
Ring Groove Depth (Compression)	.1895 - .197
Ring Groove Depth (Oil)	.1185- . 1960
Pistons for Service	Standard, .0 10, .020, .030, .040, .050, .060, oversize

Piston Pins

Type	Full Floating
Diameter and Length	.9216 - .921 8 x 3 1/16
Clearance in Piston (thumb press at 70 86; F.)	.0000 to .0005
End Play	.003 to .027
Clearance in Rod (selective)	.00 01 to .0004
Piston Pins for Service	Standard , .003, .008 oversize

Piston Rings

Number of Rings per Piston	3
Number of Compression Rings per Piston	2
Number of Oil Rings per Piston ( with exp ander)	1
Width of Rings	Upper .0775 - .07 80 Intermediate .0775 - .0780 Lower .1860 - .1865 Expander .1785 - .18 25
Piston Ring Gaps	.010 to .020
Ring Side Clearance	Upper .0020 to .0035 Intermediate .0015 to .003 Lower .001 to .003

Valves - Intake

Head Diameter	1 3/4
Length (to top of valve face)	4 51/64
Stem Diameter	.372 to .373
Stem to Guide Clearance< Maximum Allow able	.001 to .003 .004
Face Angle	44 1/2º - 45 6;

Valves - Exhaust

Head Diameter	1 13/32
Length (to top of valve face)	4 3/4
Stem Diameter	.371 to .372
Stem to Guide Clearance Maximum Allowa ble	.002 to .004 .006
Face Angle	44 1/2º - 45 6;
Adjustment	None

Head

Valve Springs - Outer

Number	16
Free Length	2 1/32
Load When Compressed to (valve closed)	1 11/16 - 38 to 43 lbs.
Load When Compressed to (valve open)	1 5/16 - 100 to 110 lbs.
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) Maximum Allowable	1 11/16 1 2 3/32
Use 1/16 spacer to reduce spring height	Part #400483
Valve Spring Assembled Length ( Valve spring to spring seat) Maximum Allowable	1 29/32 1 3 1/32

[Engine| Cyl #'s| Weights| Dim's| Crankshaft| Main Brg Journals]
[ Crankpin Journals| Con Rods and Brgs| Con Rod Bushing| Camshaft| Camshaft Bearing Journals ]
[ Camshaft Bearings| Camshaft Chain| Tappets| Pistons| Piston Pins| Rings| Valves Intake]
[ Valves Exhaust| Valve Springs - Outer| Valve Springs - Inner]
[ Valve Guides| Exhaust Valve Seats| Valve Timing| Rocker Shafts]
[ Cylinder Block| Cylinder Head| Engine Lubrication| Tightening Reference]
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Valve Guides

Ream after Installation - Intake and Exha ust	.374 - .375
Length - Intake and Exhaust	2 19 /32
Valve seat to top of guides	Inta ke 1.0 Exhaust 1 3/32
Fit in head (Interference)	.001 - .003
Install Exhaust valve guide with oil hole toward Intake guide

Exhaust Valve Seat Inserts

Seat Angle	45º - 45 1/2 6;
Seat Width	.040 - .060
Fit in Head	.002 - .004

Valve Timing

Location of # 1 Piston with Respect to Block (TDC)	.025 - .050 below
Intake Opens (BTDC)	12º
Intake Closes (ABDC)	52º
Exhaust Opens (BBDC)	50º
Exhaust Closes (ATDC)	14º
Valve Overlaps	26º
Valve Duration	244º

Rocker Shaft Assembly

Clearance between Rocker Arm and Shaft	.001 - .002
Clearance between Rocker Shaft and bracke t	.0007 - .0027
Clearance between valve stem and Rocker A rm (dry)	.060 - .210
Pressure Lubricated	Yes (metered )

Cylinder Block

Cylinder Bore (standard)	3.62475 - 3.62725
Cylinder Bore Out of Round (max. allowabl e)	.005
Cylinder Bore Taper (max. allowable)	.020
Reconditioning Working Limits	.0 01
Maximum Allowable Oversize	.060< /TD>
Tappet Bore (diameter)	.905 - .90 55
Distributor Lower Drive Shaft Bushing	Fit in Block (interference) .0015 - .004 Ream To .4865 - .4875 Shaft to Bushing Cleareance .0007 - .0022

Cylinder Head

Number Used	2
Combustion Chamber	Hemispherical
Valve Seat Run-out (maximum)	.00 3
Valve Seat Out-of-Round	.0005
Intake Valve Seat Angle Seat Width (fi nished)	45º to 45 1/2º .060 to .085
Exhaust Valve Seat Angle Seat Width (f inished)	45º to 45 1/2º .040 to .060
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
Pump Drive	Camshaft
Operating Pressure at 40 to 50 MPH
Pressure Drop Resulting from Clogged Filt er	15 to 20 lb.

< TD>40 to 45

Tightening Reference - FOOT POUNDS

Camshaft sprocket hub nut	120 to 130
Camshaft sprocket hub thrust plate bolt	15 to 20
Carburetor to manifold stud nut	15 to 20
Chain case cover bolt	30 to 35
Clutch housing bolt	25 to 30
Clutch housing pan bolt	25 to 30
Clutch housing pan drain plug	30 to 40
Clutch housing vent screen bolt	5 to 10
Connecting Rod Bearing Bolt nut	45 to 50
Cylinder head bolt	80 to 85
Distributor clamp bolt	12 to 17< /TD>
Engine front support foot bolt nut
Engine front support insulator bolt	40 to 45
Exhaust manifold stud nut	30 to 35
Exhaust pipe flange bolt nut	40 to 45
Fan blade bolt	12 to 17
Flywheel housing to cylinder block bolt	40 to 45
Fuel pump bolt	25 to 30
Generator adjusting strap bolt	1 2 to 17
Generator adjusting strap mounting bolt	25 to 30
Generator bracket bolt	45 to 50< /TD>
Generator mounting bolt	15 to 20
Ignition cable cover bolt	5 to 1 0
Intake manifold bolt	25 to 30
Main bearing cap bolt	80 to 85
Oil filter bolt	25 to 30
Oil level indicator tube bracket bolt nut	5 to 10
Oil pan bolt	12 to 17
Oil pan drain plug	30 to 35
Oil pump cover bolt	10 to 12
Oil pump mounting bolt	30 to 35< /TD>
Spark plugs	30 to 32
Vibration damper hub bolt	130 to 140
Vibration damper inertia member flange bo lt	15 to 17
Water outlet elbow bolt	30 to 35
Water pump body bolt	25 to 30
Water pump housing bolt	25 to 30

Tightening Reference - INCH POUNDS

Crankcase vent outlet pipe bolt	12 to 15
Manifold heat control counterweight bolt< /TH>	40 to 45
Rocker cover stud nut	25 to 30
Rocker cover bolt	25 to 30
Tappet chamber cover bolt	35 to 45