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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 Plugs | 25-35 |
| Crankshaft bearing caps to cylinder block | 95-120 |
| Connecting rods | 30-40 |
| Cylinder head to cylinder block | 65-80 |
| Harmonic balancer to crankshaft | 140 MINIMUM |
| Fan driving pulley to harmonic balancer | 18-25 |
| Flywheel to crankshaft (both auto and manual) | 50-65 |
| Oil pan to cylinder block | 09-13 |
| Oil pan drain plug | 25-35 |
| Oil pump cover to timing chain cover | 08-12 |
| Oil pump pressure regulator retainer | 25-30 |
| Oil screen housing to cylinder block | 06-09 |
| Oil pan baffle to cylinder block | 09-13 |
| Oil galley plugs | 20-30 |
| Filter assembly to pump cover | 10-15 |
| Timing chain cover to block | 17-23 |
| Water pump cover to timing chain cover | 06-08 |
| Fan driven pulley | 17-23 |
| Thermostat housing to intake manifold | 17-23 |
| Intake manifold to cylinder head | 45-55 |
| Exhaust manifold to cylinder head | 10-15 |
| Carburetor to intake manifold | 10-15 |
| Fuel pump to cylinder block | 17-23 |
| Motor mount to cylinder block | 50-75 |
| Fuel pump eccentric to timing chain sprocket to camshaft | 40-55 |
| Rocker arm cover to cylinder head | 03-05 |
| Rocker arm shaft bracket to cylinder head | 25-35 |
| Delcotron (alternator) bracket to cylinder head | 30-40 |
| Delcotron (alternator) bracket to water pump timing chain cover | 18-25 |
| Delcotron (alternator) mounting bracket thru Delcotron to cylinder head at pivot location | 30-40 |
| Starting motor to block | 30-40 |
| Starting motor brace to block | 09-13 |
| Starter motor brace to starting motor | 09-13 |
| Distributor hold down clamp | 10-15 |
| Manual lower flywheel housing plate (inspection cover) | 09-13 |
| Flywheel housing to cylinder block | 30-40 |
| Fuel filter to cylinder head | 10-15 |
GENERAL SPECIFICATIONS
| Wildcat 310 (300 Cu, In.) |
Wildcat 350 (340 Cu In.) |
Wildcat 375 (340 Cu. In) |
|
| Code number prefix | ML | MA | MB |
| Export code number prefix | MM | MC | N/A |
| Engine type | 90° V8 | 90° V8 | 90° V8 |
| Bore and stroke | 3.750 x 3.400 | 3.750 x 3.850 | 3.750 x 3.850 |
| Piston Displacement | 300 Cu. In. | 340 Cu In. | 340 Cu. In. |
| Carburetor type | 2 barrel | 2 barrel | 4 barrel |
| Compression ratio | 9.0:1 | 9.0:1 | 10.25:1 |
| Gasoline requirements | regular | regular | premium |
| Brake horsepower @ RPM | 210/4600 | 220/4000 | 260/4000 |
| Maximum torque @ RPM | 310/2400 | 340/2400 | 365/2800 |
| Taxable horsepower | 33.748 | 45.0 | 45.0 |
| Octane requirements motor | 85 | 85 | 90 |
| Octane requirements research | 93 | 93 | 99 |
| Cylinder numbers front to rear | |||
| Left bank | 1-3-5-7 | 1-3-5-7 | 1-3-5-7 |
| Right bank | 2-4-6-8 | 2-4-6-8 | 2-4-6-8 |
| Firing Order | 1-8-4-3-6-5-7-2 | 1-8-4-3-6-5-7-2 | 1-8-4-3-6-5-7-2 |
| Piston and pin specifications: | |
| Piston | |
| Material | Cast aluminum alloy |
| Type | Divorced skirt |
| Finish | Cam ground |
| Piston Pins | |
| Material | Extruded SAE-1018 |
| Type | Pressed in rod |
| Crankshaft specifications: | |
| Material | Pearlitic malleable iron |
| Bearings | 5 replaceable steel backed |
| Bearing material | #1, #2, #3, and #4 M/400 #5 M/100 Durex |
| Bearing taking thrust load | #3 |
| Camshaft specifications: | |
| Material | Cast alloy iron |
| Bearings | Steel backed Babbitt |
| Number of bearings | 5 |
| Drive | Chain |
| Number of links | 54 |
| Crankshaft sprocket | Sintered Iron |
| Camshaft sprocket | Nylon coated aluminum |
| Lubrication system specifications: | |
| Type of lubrication | |
| Main bearings | Pressure |
| Connecting rods | Pressure |
| Piston pins | Splash |
| Camshaft bearings | Pressure |
| Timing chain | Splash and nozzle |
| Cylinder walls | Splash and nozzle |
| Oil pump type | Gear driven |
| Normal oil pressure | 33lbs. @ 2400 RPM |
| Oil pressure sending unit | Electrical |
| Oil intake | Stationary |
| Oil filter system | Full flow |
| Filter type | Throw away element and can |
| Crankcase capacity | |
| Less filter | 4qts. |
| With filter | 5qts. |
| 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 length | 3.060 |
| 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 | |
| #1 | 1.785-1.786 |
| #2 | 1.755-1.756 |
| #3 | 1.725-1.726 |
| #4 | 1.695-1.696 |
| #5 | 1.665-1.666 |
| 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: | |
| Material | Pearlitic malleable iron |
| Rod bearing | Removable steel backed M/400 |
| Ring specifications: | |
| #1 compression | Cast iron-chrome plated |
| #2 compression | Cast iron-lubrited |
| Oil control | Steel-uncoated |
| Oil ring expander | Steel humped ring |
| Ring locations | Above pin |
| Valve specifications: | |
| Intake valve material | SAE 1041 steel |
| Exhaust valve material | GM-N82152 (21-4N) |
| Valve lifter mechanism | Hydraulic |
| Valve spring | Single helical |
| Cooling system specifications: | |
| System type | Pressure |
| Radiator cap relief pressure | 15 PSI |
| Thermostat | Choke type opening at 180° |
| Water pump | |
| Type | Centrifugal |
| GPM @ RPM | 14 @ 100 |
| Drive | V-Belt |
| Bearings | Double row |
| By-pass recirculation type | External |
| Cooling system capacities: | ||
| (300 Cu. In.) | (340 Cu. In.) | |
| With heater | 12.7qts. | 12.7qts. |
| W/O heater | 12.2qts. | 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 AC | 18" x 4 |
| With AC | 18" x 7 |
| Fan Drive | |
| Less AC | Water pump shaft |
| With AC | Torque and temperature sensitive clutch |
| Valve system specifications: | |
| Rocker arm ratio | 1.6 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 rate | 12 to 60 sec. In test fixture |
| Intake valve | |
| Head diameter | 1.8175-1.8075 |
| Seat angle | 45° |
| Stem diameter | (top) .3415-.3412 (bottom) .3405 |
| Clearance in guide | .0012-.0032 & .0003 max taper |
| Valve spring | |
| Valve closed- Pounds @ length | 64 ± 5 @ 1.727 |
| Valve open- Pounds @ length | 164 ± 6 @ 1.340 |
| Exhaust Valve | |
| Head diameter | 1.380-1.370 |
| 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 @ length | 64 ± 5 @ 1.727 |
| Valve open- Pound @ length | 164 ± 6 @ 1.340 |
| Crankshaft specifications: | |
| Endplay at thrust bearing | .004-.008 |
| Main bearing journal diameter | 2.9995 |
| Crankpin journal diameter | 2.0000 |
| Main bearing overall length | |
| #1 | .864 |
| #2 | .864 |
| #3 | 1.057 |
| #4 | .864 |
| #5 | .864 |
| Main bearing to journal clearance | .0004-.0015 |