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General Specifications for the 1966 Buick 300 and 340 Cubic Inch Engines The following information has been directly complied from original Buick service manuals for the respective year of vehicle manufacture. These specifications should also be correct for the 1967 model year.

        contributed by Aaron

Bolt Torque Specifications
AREA:Torque Lb. Ft.
Spark Plugs25-35
Crankshaft bearing caps to cylinder block95-120
Connecting rods30-40
Cylinder head to cylinder block65-80
Harmonic balancer to crankshaft140 MINIMUM
Fan driving pulley to harmonic balancer18-25
Flywheel to crankshaft (both auto and manual)50-65
Oil pan to cylinder block09-13
Oil pan drain plug25-35
Oil pump cover to timing chain cover08-12
Oil pump pressure regulator retainer25-30
Oil screen housing to cylinder block06-09
Oil pan baffle to cylinder block09-13
Oil galley plugs20-30
Filter assembly to pump cover10-15
Timing chain cover to block17-23
Water pump cover to timing chain cover06-08
Fan driven pulley17-23
Thermostat housing to intake manifold17-23
Intake manifold to cylinder head45-55
Exhaust manifold to cylinder head10-15
Carburetor to intake manifold10-15
Fuel pump to cylinder block17-23
Motor mount to cylinder block50-75
Fuel pump eccentric to timing chain sprocket to camshaft40-55
Rocker arm cover to cylinder head03-05
Rocker arm shaft bracket to cylinder head25-35
Delcotron (alternator) bracket to cylinder head 30-40
Delcotron (alternator) bracket to water pump timing chain cover18-25
Delcotron (alternator) mounting bracket thru Delcotron to cylinder head at pivot location30-40
Starting motor to block30-40
Starting motor brace to block09-13
Starter motor brace to starting motor09-13
Distributor hold down clamp10-15
Manual lower flywheel housing plate (inspection cover)09-13
Flywheel housing to cylinder block30-40
Fuel filter to cylinder head10-15
300-340

GENERAL SPECIFICATIONS

 Wildcat 310
(300 Cu, In.)		Wildcat 350
(340 Cu In.)		Wildcat 375
(340 Cu. In)
Code number prefixMLMAMB
Export code number prefixMMMCN/A
Engine type90° V890° V890°V8
Bore and stroke3.750 x 3.4003.750 x 3.8503.750 x 3.850
Piston Displacement300 Cu. In.340 Cu In.340 Cu. In.
Carburetor type2 barrel2 barrel4 barrel
Compression ratio9.0:19.0:110.25:1
Gasoline requirementsregularregularpremium
Brake horsepower @ RPM210/4600220/4000260/4000
Maximum torque @ RPM310/2400340/2400365/2800
Taxable horsepower33.74845.045.0
Octane requirements motor858590
Octane requirements research939399
Cylinder numbers front to rear
Left bank1-3-5-71-3-5-71-3-5-7
Right bank2-4-6-82-4-6-82-4-6-8
Firing Order1-8-4-3-6-5-7-21-8-4-3-6-5-7-21-8-4-3-6-5-7-2

Piston and pin specifications:
Piston
MaterialCast aluminum alloy
TypeDivorced skirt
FinishCam ground
Piston Pins
MaterialExtruded SAE-1018
TypePressed in rod

Crankshaft specifications:
MaterialPearlitic malleable iron
Bearings5 replaceable steel backed
Bearing material#1, #2, #3, and #4 M/400 #5 M/100 Durex
Bearing taking thrust load#3

Camshaft specifications:
MaterialCast alloy iron
BearingsSteel backed Babbitt
Number of bearings5
DriveChain
Number of links54
Crankshaft sprocketSintered Iron
Camshaft sprocketNylon coated aluminum

Lubrication system specifications:
Type of lubrication
Main bearingsPressure
Connecting rodsPressure
Piston pinsSplash
Camshaft bearingsPressure
Timing chainSplash and nozzle
Cylinder wallsSplash and nozzle
Oil pump typeGear driven
Normal oil pressure33lbs. @ 2400 RPM
Oil pressure sending unitElectrical
Oil intakeStationary
Oil filter systemFull flow
Filter typeThrow away element and can
Crankcase capacity
Less filter4qts.
With filter5qts.

ENGINE DIMENTIONS AND FITS
General:
Piston Clearance limits
Top land.0265-.0345
Skirt- Top.0005-.0011
Skirt- Bottom.0005-.0021
Ring groove depth
#1 compression ring.1855-.1930
#2 compression ring.188-.1955
#3 Oil ring.188-.1955
Ring width
#1 compression ring.0785-.0789
#2 compression ring.0770-.0780
#3 Oil ring.1810-.1870
Ring gap
#1 compression ring.010-.020
#2 compression ring.010-.020
#3 Oil ring.015-.035
Piston pin length3.060
Diameter of pin.9394-.9397
Clearance
In piston.0001-.0004
In rod.0007-.0015 Press
Direction and amount off set in piston.040 Toward high thrust side
*All measurements are in inches unless otherwise specified

Camshaft specifications:
Bearing journal diameter
#11.785-1.786
#21.755-1.756
#31.725-1.726
#41.695-1.696
#51.665-1.666
Journal clearance in bearings.005-.0035 (#2, #3, #4, & #5)

Connecting rod specifications:
Bearing length.737
Bearing clearance (Limits).0020-.0023
End play- Total for both rods.006-.014
Connecting rods:
MaterialPearlitic malleable iron
Rod bearingRemovable steel backed M/400

Ring specifications:
#1 compressionCast iron-chrome plated
#2 compressionCast iron-lubrited
Oil control Steel-uncoated
Oil ring expanderSteel humped ring
Ring locationsAbove pin

Valve specifications:
Intake valve materialSAE 1041 steel
Exhaust valve materialGM-N82152 (21-4N)
Valve lifter mechanismHydraulic
Valve springSingle helical

Cooling system specifications:
System typePressure
Radiator cap relief pressure15 PSI
ThermostatChoke type opening at 180°
Water pump
TypeCentrifugal
GPM @ RPM14 @ 100
DriveV-Belt
BearingsDouble row
By-pass recirculation typeExternal

Cooling system capacities:
 (300 Cu. In.)(340 Cu. In.)
With heater12.7qts.12.7qts.
W/O heater12.2qts.12.2qts.
With air conditioning (all except 300 station wagon)14.0qts.14.7qts.
With air conditioning (Station Wagon)14.7qts.14.7qts.

Fan diameter and number of blades:
Less AC18” x 4
With AC18” x 7
Fan Drive
Less ACWater pump shaft
With ACTorque and temperature sensitive clutch

Valve system specifications:
Rocker arm ratio1.6 to 1
Rocker arm clearance on shaft.0017-.0032
Valve lifter diameter.8422-.8427
Valve lifter clearance in crankcase.0015-.003
Valve lifter leak down rate12 to 60 sec. In test fixture
Intake valve
Head diameter1.8175-1.8075
Seat angle45°
Stem diameter(top) .3415-.3412 (bottom) .3405
Clearance in guide.0012-.0032 & .0003 max taper
Valve spring
Valve closed- Pounds @ length64 ± 5 @ 1.727
Valve open- Pounds @ length164 ± 6 @ 1.340
Exhaust Valve
Head diameter1.380-1.370
Seat angle 45°
Stem diameter(top) .3402-.3412 (bottom) .3397-.3407
Clearance in guide(top) .0015-.0035 (bottom) .0021-.004
Valve spring
Valve closed- Pound @ length64 ± 5 @ 1.727
Valve open- Pound @ length164 ± 6 @ 1.340

Crankshaft specifications:
Endplay at thrust bearing.004-.008
Main bearing journal diameter2.9995
Crankpin journal diameter2.0000
Main bearing overall length
#1.864
#2.864
#31.057
#4.864
#5.864
Main bearing to journal clearance.0004-.0015
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