GENERAL SPECIFICATIONS
|
| Model Designation: Roadmaster
8 - Series 70; |
| Wheel base: Roadmaster
8: 126-1/4; 130-1/4 on model 72 |
| Valve Location: In
head |
| Bore and
Stroke: 3-7/16
x 4-5/16 |
| Piston displacement, Cubic
Inches: 320.2 |
| Compression
ratio:
7.2 |
| Maximum
Brake Horsepower:
152 @ 3600 RPM |
| Maximum
Torque Lbs.Ft. @ RPM:
280 @ 2000 RPM |
| Normal
Oil Pressure Pounds: 35 |
TUNE UP SPECIFICATIONS
|
| Spark Plug
Make: AC 46X |
| Spark Plug
Gap, Inch: .025 |
| Firing
Order: 16258374 |
| Ignition
Timing: ADV. Timing
mark on Flywheel |
| Engine
Idle Speed, RPM:
450 |
| Cylinder
Head Torque Lbs.Ft.: 65-70 |
| Compression
Pressure & Cranking Speed: 114
Min. |
| Voltage & Polarity: 6
volts, negative ground |
PISTON AND RING SPECIFICATIONS
|
Fitting
Pistons with Scale:
Piston should fall on a .0015
feeler and stay on a .002 feeler |
Ring End
Gap: (Fit rings in tapered
bores for clearance shown in tightest portion of
ring travel.)
Compression: .010
Oil: .010 (no fitting necessary with Flex-Fit oil
rings) |
| Clearance
in Groove: Compression:
.0015-.0035; Oil: .0015-.003 (Flex-Fit oil rings:
.0015-.0035 |
| Wristpin
Diameter, Inch: .8744-.8749 |
VALVE SPECIFICATIONS
|
Operating
Clearance:
Intake:
0 Exhaust: 0 |
| Valve Seat
Angle, degrees: 45 |
Valve Timing: (BTDC
= before top dead center; ATDC = after top dead
center)
Intake
opens: 14 degrees BTDC
Exhaust
Closes: 25 ATDC |
Valve Spring
Pressure Pounds at Inches Length:
Inner
Spring: 52 @ 1-5/16; Outer Spring: 119 @ 1-19/32 |
| Valve Stem
Clearance: Intake: .0025; Exhaust:
.003 |
ENGINE BEARING SPECIFICATIONS
|
Connecting Rod Bearings:
Journal
Diameter, Inches: 2.248-2.249
Bearing Clearance, Inch: .0005-.002
Rod End Play, Inch: .005-.010
Rod Bolt Tension: Lbs.Ft.: 60-65 |
Main Bearings:
Journal
Diameter, Inches:
No. 1:
2.5605-2.5615
No. 2: 2.6235-2.6245
No. 3: 2.6855-2.6865
No. 4: 2.7485-2.7495
No. 5: 2.8105-2.8115
Bearing clearance: .0005-.002
Shaft End Play: .004-.008 (Thrust
on Bearing No. 3)
Main Bolt Tension: Lbs.Ft.: 90-100 |
CAPACITY DATA
|
Cooling
System:
Without
heater: 18 quarts
With heater: 19-1/2 quarts |
| Fuel Tank: 19
gallons |
| Engine
Oil: 7 quarts |
| Transmission: w/auto
11 qts. |
| Rear Axle: 3-1/2
pints |
1951 Buick 320 Inline 8 (152 hp) Engine Specs
1951 Buick 320 Inline 8 Engine Specs:
Delco-Remy Distributor Specs
1951 Buick 320 Inline 8 Engine Specs:
Delco-Remy Generator Specs
1951 Buick 320 Inline 8 Engine Specs:
Delco-Remy Regulator Specs
1951 Buick 320 Inline 8 Engine Specs:
Delco-Remy Starting Motor Specs
1951 Buick 320
Wheel Alignment Specs
Return to Buick Engine Specs Index
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