1971 Mustang Engine Information – 302 cubic inch V-8 (4.9 L Windsor V8)
The Economical V8
The 302 cubic inch engine was introduced in 1968 to the Mustang and continued to be offered in 1970 and then again in 1971. The 302 was marketed as the “economical 302-2v” and was the base Mustang V8 engine and was standard on the Mach 1. The Mustang also had the proden three-speed manual transmission as standard.
Learn more about the Ford Mustang 302 engine
Engine Basics
| Year |
1971 |
| bbl |
2 barrel |
| Cylinders |
V8 |
| Power (hp) |
210 hp @ 4,600 RPM |
| Torque (lb/ft) |
296 lb/ft @ 2,600 RPM |
| Compression |
9.0:1 |
| Displacement |
302 cu / 4.9 liters |
| Bore x Stroke |
4.000 x 3.00 |
Engine Specs (302 cid V8)
| Spark Plugs |
|
| Oil filter |
|
| Gas Filter |
|
| Air Filter |
|
| PCV |
|
| Oil |
5 quarts of 10W30 or 10W40 |
| Oil Pressure |
35 – 60 PSI |
| Points |
Gap and Dwell at xxx RPM |
| Timing |
6 Degrees BTDC Manual & 6 Degrees BTDC Automatic |
| Valve adjustment |
|
| Valve size |
|
| Valve arrangement |
R. Side I E I E I E I E Front to rear |
| Valve arrangement |
L. Side E I E I E I E I Front to rear |
| Manifold Vacuum |
18 inches at idle |
|
|
| Warm Idle Manual Trans |
575-600 RPM |
| Warm Idle Auto Trans |
475-500 RPM |
| Carburetor CFM |
|
| Bore and stroke |
4.00 X 3.0028 |
| Compression |
9.5:1 (155 – 199 psi @ cranking speed), 9.0:1 5.0L |
| Compression Pressure |
130-170 @ cranking speed |
| HP and Torque |
210 or 225 (HO) hp at 4400 RPM and 158 ft/lbs torque at 2400 RPM |
| Taxable HP |
51.2 |
| Distributor Rotation |
Counter Clockwise |
| Firing order |
Non H.O.’s = 1 – 5 – 4 – 2 – 6 – 3 – 7 – 8 |
Engine Torque Specifications
All torque specifications provided in this table are those recommended by FORD. If you use special bolts, follow the torque specifications provided by the manufacturer. I recommend that you use the 3 step torque technique where you torque down the bolts in three equal steps. Once you have reached the maximum recommended torque setting, go around one more time. Do not torque in a circular pattern. Always torque cross to cross.
| Head bolts |
65-70 |
| Crank cap bolts |
60-70 |
| Rod end caps |
19-24 |
| Intake bolts |
20-22 |
| Exhaust manifold bolts |
15-20 |
| Upper intake on EFI |
12-18 |
| Harmonic damper |
70-90 |
| A/C Compressor mounts |
|
| Engine fan |
|
| Motor mounts to engine |
85 |
| Bellhousing bolts |
|
| Trans to bellhousing |
25 |
| Flywheel to Crankshaft |
75-85 |
| Oil pan bolts |
7-9 |
| Valve cover bolts |
10 |
| Carburetor mount bolts |
|
| Oil pickup |
10-15 |
| Spark plugs |
|
| Oil pump mounting bolts |
22-32 |
| Trans. inspection plate |
|
| Water pump bolts |
15-22 |
| Clutch Pressure plate |
35 |
| Water Pump |
20 |
| Upper cam gear bolt |
40-45 |
| Rocker arm bolts |
18-25 |
| Camshaft thrust plate |
10 |
Crankshaft Bearing Journal Specifications (302)
Main Bearing Journal (inches)
| Journal Diameter |
2.2482 – 2.2490 |
| Oil Clearance |
0.0005- 0.0024 Except #1 bearing which is 0.001- 0.0018
|
| Shaft end play |
0.004 – 0.008 |
| Thrust on number |
3 |
Connecting Rod Journals
| Journal Diameter |
2.1228 – 2.1236 |
| Oil Clearance |
0.008 – 0.0026 |
| Side clearance |
0.003 – 0.010 |
Piston Ring Specifications (302)
Comp Ring Width
| Top |
0.077 – 0.078 |
| Bottom |
0.077 – 0.078 |
Ring side clearance
| Top |
0.002 – 0.004 |
| Bottom |
0.002 – 0.004 |
| Oil ring |
Snug |
Ring gap width
| Top |
0.010 – 0.020 |
| Bottom |
0.010 – 0.020 |
| Oil Ring |
0.015 – 0.069 |
Piston Specifications
|
302 |
| Code Red |
3.9984 – 3.3990 |
| Code Blue |
3.9996 – 4.0002 |
| 0.003 Oversize |
4.0008 – 4.0014 |
| Piston to Cyl. Bore clearance |
0.0018 – 0.0026 |
| Piston Pin Bore Dia. |
0.9123 – 0.9126 |
Valve Specifications
| Year |
1971 |
| Seat angle |
45 |
| Face angle |
44 |
| Valve spring pressure lbs/inches |
180 @ 1.23 |
| Valve spring installed height (in) |
1 21/32 |
| Stem guide clearance (in) – Intake |
0.0010 – 0.0027 |
| Stem guide clearance (in) – Exhaust |
0.0015 – 0.0032 |
| Stem Diameter (in) – Intake |
0.342 |
| Stem Diameter (in) – Exhaust |
0.3415 |
Tune Up Specs
| Year |
1971 “F” Code |
| Spark Plug |
Autolite BRF-42 |
| Plug Gap |
.032″-.036″ |
| Dwell |
24-29 (manual), 26-31 (automatic)
|
| Point Gap |
.017″-.021″ |
| Intake |
1.773″-1.788″ |
| Exhaust |
1.442″-1.457″ |
| Carburetor |
Autolite 2300-A (2V) Automatic choke
|
I have a 1971 Ford Mustang 302 Windsor three speed
How many teeth are in my fly wheel
157 or 164
10” or 11”. The car is all original need to order a clutch