GENERAL SPECIFICATIONS
|
| Model Designation: Special
8 - Series 40 |
| Wheel base: Special
8: 121-1/2 |
| Valve Location: In
head |
| Bore and
Stroke: 3-3/16
x 4-1/8 |
| Piston displacement, Cubic
Inches: 263.3 |
| Compression
ratio: Special 8:
7.0 |
| Maximum
Brake Horsepower:
125 @ 3800 RPM |
| Maximum
Torque Lbs.Ft. @ RPM:
224 @ 2200 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: .015
Oil: .015 (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: .8124-.8129 |
VALVE SPECIFICATIONS
|
Operating
Clearance:
Intake: .015 Hot Exhaust: .015 Hot
(0 with hydraulic lifters) |
| Valve Seat
Angle, degrees: 45 |
Valve Timing: (BTDC
= before top dead center; ATDC = after top dead
center)
Intake
opens: 13 degrees BTDC
Exhaust
Closes: 22 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: 2.125-2.126
Bearing Clearance, Inch: .0005-.002
Rod End Play, Inch: .005-.010
Rod Bolt Tension: Lbs.Ft.: 40-45 |
Main Bearings:
Journal
Diameter, Inches:
No. 1:
2.5605-2.5615
No. 2: 2.6235-2.6145
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: 12 quarts (with Dynaflow 13-1/2)
With heater: 13-1/2; quarts (with Dynaflow
15) |
| Fuel Tank: 19
gallons |
| Engine
Oil: 5-1/2 quarts |
| Transmission: 1-3/4
w/auto 9-1/2 qts. |
| Rear Axle: 4-1/2
pints |
1953 Buick 263 (125 hp) Inline 8 Engine Specs
1953 Buick 263 Inline 8 Engine Specs:
Delco-Remy Distributor Specs
1953 Buick 263 Inline 8 Engine Specs:
Delco-Remy Generator Specs
1953 Buick 263 Inline 8 Engine Specs:
Delco-Remy Regulator Specs
1953 Buick 263 Inline 8 Engine Specs:
Delco-Remy Starting Motor Specs
1953 Buick 263:
Wheel Alignment Specs
Return to Buick Engine Specs Index
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