GENERAL SPECIFICATIONS
|
| Model Designation: Roadmaster
8 Series 70 |
| Wheel base: 129 |
| Valve Location: In
head |
| Bore and
Stroke: 3-7/16
x 4-5/16 |
| Piston displacement, Cubic
Inches: 320.2 |
| Compression
ratio: 6.6 |
| Maximum
Brake Horsepower: 144
@ 3600 RPM |
| Maximum
Torque Lbs.Ft. @ RPM: 276
@ 2000 RPM |
| Normal
Oil Pressure Pounds: 35
|
TUNE UP SPECIFICATIONS
|
| Spark Plug
Make: AC 48 |
| 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: 112
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 .00225 feeler |
Ring End
Gap: (Fit rings in tapered
bores for clearance shown in tightest portion of
ring travel.)
Compression: .010
Oil: .010 |
| Clearance in Groove: Compression:
.0015-003; Oil: .0015-.003 |
| Wristpin
Diameter, Inch: .8744-.8749 |
VALVE SPECIFICATIONS
|
Operating
Clearance:
Intake:
.015 Hot Exhaust: .015 Hot (with hydraulic
lifters, clearance is 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: 51 @ 1-5/16; Outer Spring: 77 @ 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-.0025
Shaft End Play: .004-.008 (Thrust
on Bearing No. 3)
Main Bolt Tension: Lbs.Ft.: 90-100 |
CAPACITY DATA
|
Cooling
System:
Without
heater: 16-3/4 quarts
With heater: 18 quarts |
| Fuel Tank: 19
gallons |
| Engine
Oil: 7 quarts |
| Transmission: 2-1/2;
automatic: 11 quarts |
| Rear Axle: 4
pints |
1948 Buick 320 Inline 8 (144 hp) Engine Specs
1948 Buick 320 Inline 8 (150 hp) Engine Specs
1948 Buick 320 Inline 8 Engine Specs:
Delco-Remy Distributor Specs
1948 Buick 320 Inline 8 Engine Specs:
Delco-Remy Generator Specs
1948 Buick 248 Inline 8 Engine Specs:
Delco-Remy Regulator Specs
1948 Buick 248 Inline 8 Engine Specs:
Delco-Remy Starting Motor Specs
1948 Buick:
Wheel Alignment Specs
Return to Buick Engine Specs Index
|
