1970 351

1970 Mustang Engine Information & Specs – 351 Windsor V8 (5.8 L)

351 Windsor V8 Technical Specs & Data

1970 Mustang Engine Information – 351 cubic inch V-8 (5.8 L Windsor V8)

The 351 Windsor Engine

The 351 Windsor engine is an 8 cylinder, 90 degree, overhead valves (OHV) engine. It was introduced in 1969, and got its name from the Windsor Canada location of the Ford assembly plant that built them. There were two versions introduced in 1969, the 250 hp 2 barrel engine and the 290 hp 4 barrel version.

The only 351 engine that was manufactured with a dual point vacuum advance distributor was the Cleveland Boss & HO versions. All Windsor engines received the single point vacuum advance distributors. Accordingly, all Windsor engines had hydraulic lifters 2 bolt mains and all had cast iron intake manifolds.

The 1969 4bbl engine was destined to use premium leaded gasoline while all other 2 and 4 bbl versions only required regular gasoline.

Engine Basics

Year 1970 1970
bbl 2 4
Cylinders 8 8
Displacement 351 cu / 5.8 liters 351 cu / 5.8 liters
Power (hp) 250 hp @ 4600 RPM 300 hp @ 5400 RPM
Torque (lb/ft) 355 lb/ft @ 2600 RPM 380 lb/ft @ 3400 RPM
Compression 9.5:1 11.4:1
Bore x Stroke 4.00 x 3.50 4.00 x 3.50

Engine Specifications

Spark Plugs
Oil filter
Gas Filter
Air Filter
PCV
Oil 5 quarts of 10W30 or 10W40
Oil Pressure 35 – 60 PSI
Timing 6 Degrees BTDC Manual & 12 Degrees BTDC Automatic
Valve adjustment Cold
Valve size
Valve arrangement Right
Manifold Vacuum 17 inches at idle
Warm Idle Manual Trans 575-600 RPM
Warm Idle Auto Trans 500-525 RPM
Carburetor CFM
Bore and stroke
Compression
HP and Torque
Taxable HP
Distributor Rotation Clockwise
Firing order 1-3-7-2-6-5-4-8
351 Windsor weight 530 Pounds

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 95-100 (120 on Boss)
main cap bolts 95-105
Rod end bolts 4–45
Intake bolts 23-25
Exhaust manifold bolts 18-24
Harmonic damper 70-90
A/C Compressor mounts
Engine fan
Motor mounts to engine
Bellhousing bolts 25
Trans to Bellhousing
Flywheel to Crankshaft 75-85
Oil pan bolts 15
Valve cover bolts 10
Carburetor mount bolts
Oil pump 25
Spark plugs
Trans. inspection plate
Water pump bolts 25
Upper timing gear bolt 45
Clutch pressure plate 35
Camshaft thrust plate 10
Oil pump pickup 20

Crankshaft Bearing Journal Specifications

Main Bearing Journal (inches)

Journal Diameter 2.2482 – 2.2490
Oil Clearance 0.0005 – 0.0022
Shaft end play 0.004 – 0.008
Thrust on number 3

Connecting Rod Journals

Journal Diameter 2.1232 – 2.1240
Oil Clearance 0.008 – 0.0024
Side clearance 0.003 – 0.010

Piston Ring Specifications

Comp Ring Width

Top 0.0774 – 0.0781
Bottom 0.0770 – 0.0780

Ring side clearance

Top 0.0019 – 0.0036
Bottom 0.0020 – 0.0040
Oil ring Snug

Ring gap width

Top 0.010 – 0.020
Bottom 0.010 – 0.020
Oil Ring 0.015 – 0.055

Piston Specifications

Code Red 3.4982 – 3.4987
Code Blue 3.4993 – 3.4999
0.003 Oversize 3.5001 – 3.5005
Piston to Cyl. Bore clearance 0.0014 – 0.0020
Piston Pin Bore Dia. 0.9122 – 0.9125

Tune Up Specs

Year 1970 4V 1970 2V
Spark Plug Autolite ARF-42 Autolite ARF-42
Plug Gap .032″-.036″ .035″
Dwell 24-29 (manual), 26-31 (automatic) 24-29 (manual), 26-31 (automatic)
Point Gap .017″ .017″
Intake 2.185″-2.195″ 1.9025″-1.9175″
Exhaust 1.7045″-1.7145″ 1.533″-1.548″
Carburetor Autolite 4300-A (4V ) Squarebore auto choke Autolite 2300-A (2V) Automatic choke
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