Buick 350 Engine Specifications and Blueprinting.
General Specifications for the
1970 Buick 35 Cubic Inch Engines.
The following information has been directly complied from original 1970 Buick service manual.
Use a reliable torque wrench to obtain the figures listed below. This will prevent straining or distorting the parts as well as preventing thread damage. These specifications are for clean and lightly lubricated threads only. Dry or dirty threads produce friction which prevents accurate measurements of the actual torque. It is important that these specifications be strictly observed. Over tightening can damage threads. This will prevent attainment of the proper torque and will require replacement of the damaged part.
| Bolt Torque Specifications |
| AREA: |
Torque Lb. Ft. |
| Spark Plugs |
15 |
| Crankshaft bearing caps to cylinder block |
95 |
| Connecting rods |
35 |
| Cylinder head to cylinder block |
75 |
| Harmonic balancer to crankshaft |
120 MINIMUM |
| Fan driving pulley to harmonic balancer |
23 |
| Flywheel to crankshaft (both auto and manual) |
60 |
| Oil pan to cylinder block |
14 |
| Oil pan drain plug |
30 |
| Oil pump cover to timing chain cover |
10 |
| Oil pump pressure regulator retainer |
35 |
| Oil screen housing to cylinder block |
8 |
| Oil pan baffle to cylinder block |
11 |
| Oil galley plugs |
25 |
| Oil pressure switch to cylinder block |
23 |
| Filter assembly to pump cover |
13 |
| Timing chain cover to block |
29 |
| Water pump cover to timing chain cover |
7 |
| Fan driven pulley |
20 |
| Thermostat housing to intake manifold |
20 |
| Automatic choke cover to cylinder head |
8 |
| Intake manifold to cylinder head |
55 |
| Exhaust manifold to cylinder head |
18 |
| Carburetor to intake manifold |
13 |
| Fuel pump to cylinder block |
20 |
| Motor mount to cylinder block |
63 |
| Fuel pump eccentric to timing chain sprocket to camshaft |
48 |
| Rocker arm cover to cylinder head |
4 |
| Rocker arm shaft bracket to cylinder head |
25 |
| Delcotron bracket to cylinder head |
35 |
| Delcotron adjusting bracket to cylinder head |
22 |
| Delcotron mounting bracket thru delcotron to cylinder head at pivot location |
35 |
| Starting motor to block |
35 |
| Starting motor brace to block |
11 |
| Starter motor brace to starting motor |
11 |
| Distributor hold down clamp |
13 |
| Automatic Lower Flywheel Housing plate |
4 |
| Flywheel housing to cylinder block |
35 |
Head bolt torque pattern for Buick 350 to 1969.
Head bolt torque pattern for Buick 350 from 1970.
GENERAL SPECIFICATIONS
| |
350-2 |
350-4 |
350-4 |
| Code number prefix |
SO |
SB |
SP |
| Engine type |
90° V8
|
| Bore and stroke |
3.80 x 3.850 |
3.80 x 3.850 |
3.80 x 3.850 |
| Piston Displacement |
350 Cu. In. |
350 Cu In. |
350 Cu. In. |
| Carburetor type |
2 barrel |
4 barrel |
4 barrel |
| Compression ratio |
9.0:1 |
9.0:1 |
10.25:1 |
| Gasoline requirements |
regular |
regular |
premium |
| Brake horsepower @ RPM |
230/4400 |
285/4600 |
315/4800 |
| Maximum torque @ RPM |
350/2400 |
375/3200 |
410/3200 |
| Taxable horsepower |
46.2 |
46.2 |
46.2 |
| 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 |
| Connecting rods: |
| Material |
Pearlitic malleable iron forged - SAE-1053 steel |
| Rod bearing |
Removable steel backed M/400 aluminum |
| Ring specifications: |
| #1 compression |
Cast iron-molybdenum coated |
| #2 compression |
Cast iron-lubricated |
| Oil control |
Steel-uncoated |
| Oil ring expander |
Hump type |
| Ring locations |
Above pin |
| Crankshaft specifications: |
| Material |
Nodular 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 |
| Valve specifications: |
| Intake valve material |
SAE 1041 steel - Aluminized Face and Chrome Flashed Stem |
| Exhaust valve material |
21-2 Aluminized Face and Chrome Flashed Stem |
| Valve lifter mechanism |
Hydraulic |
| Valve spring |
Single helical |
| 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 |
37lbs. @ 2400 RPM |
| Oil pressure sending unit |
Electrical |
| Oil intake |
Stationary |
| Oil filter system |
Full flow |
| Filter type |
Throw away element and can |
| Crankcase capacity |
| With filter |
5qts. |
| Less filter |
4qts. |
| Cooling system specifications: |
| System type |
Pressure |
| Radiator cap relief pressure |
15 PSI |
| Thermostat |
Choke type opening at 190° |
| Water pump |
| Type |
Centrifugal |
| GPM @ RPM |
10 @ 1000 |
| Drive |
V-Belt |
| Bearings |
Double row |
| By-pass recirculation type |
External |
| Cooling system capacities: |
| |
(350 Cu. In. "A") |
(350 Cu. In. LeSabre) |
| With heater |
16.5qts. |
16.2qts. |
| With air conditioning |
15.5qts. |
16.6qts. |
| Fan diameter and number of blades: |
| 350 Less AC |
18" x 4 |
| 350 With AC |
18" x 7 |
| Fan Drive |
| Less AC |
Water pump shaft |
| With AC |
Torque and temperature sensitive clutch |
| ENGINE DIMENTIONS AND FITS |
| General: |
| Piston Clearance limits |
| Top land |
.027-.036 |
| Skirt- Top |
.0008-.0014 |
| Skirt- Bottom |
.0013-.0029 |
| Ring groove depth |
| #1 compression ring |
.1855-.1930 |
| #2 compression ring |
.1880-.1955 |
| #3 Oil ring |
.1880-.1955 |
| Ring width |
| #1 compression ring |
.0770-.0880 |
| #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 |
.00075-.00125 Press |
| Direction and amount off set in piston |
.040 major thrust side |
| *All measurements are in inches unless otherwise specified |
| Connecting rod specifications: |
| Bearing length |
.737 |
| Bearing clearance (Limits) |
.0020-.0023 |
| End play- Total for both rods |
.006-.014 |
| Crankshaft specifications: |
| End play at thrust bearing |
.003-.009 |
| Main bearing journal diameter, 300 |
2.9995 |
| Crank pin 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 |
| Camshaft specifications: |
| Bearing journal diameter |
| #1 |
1.785-1.786 |
| #2 |
1.785-1.786 |
| #3 |
1.785-1.786 |
| #4 |
1.785-1.786 |
| #5 |
1.785-1.786 |
| Journal clearance in bearings |
.005-.0035 (#2, #3, #4, & #5) |
| Valve system specifications: |
| Rocker arm ratio |
1.55 to 1 |
| Rocker arm clearance on shaft |
.0022-.0037 |
| Valve lifter diameter |
.8422-.8427 |
| Valve lifter clearance in crankcase |
.0008-.0023 |
| Valve lifter leak down rate |
12 to 60 sec. In test fixture |
| Intake valve |
| Overall length |
5.024 - 4.994 |
| Head diameter |
1.880-1.870 |
| Seat angle |
45° |
| Stem diameter |
(top) .3725 ± .0005 |
| Clearance in guide |
.0015 - .0025 & .0003 max taper |
| Valve Stem Height |
|
| Valve spring |
| Valve closed- Pounds @ length |
75 ± 5 @ 1.727 |
| Valve open- Pounds @ length |
180 ± 7 @ 1.340 |
| Exhaust Valve |
| Overall length |
5.044 - 5.014 |
| Head diameter |
1.505 - 1.495 |
| Seat angle |
45° |
| Stem diameter |
.3723 Min. and .3730 Max. |
| Clearance in guide |
.0015 -.0032 & .0002 max. taper |
| Valve Stem Height |
|
| Valve spring |
| Valve closed- Pound @ length |
75 ± 5 @ 1.727 |
| Valve open- Pound @ length |
180 ± 7 @ 1.340 |
| Valve stem, installed height |
|
| Cubic Inches |
350 |
| Bore |
3.800 |
| Stroke |
3.850 |
| Rod Length |
6.387 |
| Rod / Stroke Ratio |
1.6514 |
| Bore / Stroke Ratio |
0.9870 |
| Bore Spacing |
4.240 |
| Deck Height |
10.187 |
| Bore Center |
4.240 |
Fel-Pro BS40032 seal, designed for the Ford 429-460, work on the Buick 350 rear main seal.
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