1969 Mustang Engine Information - 302 cubic inch V-8 & Boss 302

1969 Mustang Engine Information & Specs – 302 Windsor + 302 Boss V8

The 302 Windsor V8 + Boss V8 Technical Specs & Data

1969 Mustang Engine Information – 302 cubic inch V-8 (4.9 L Windsor V8 + & Boss V8)

The 302 Windsor V8 + A Big Welcome To The Boss 302

The 302 cubic inch engine was introduced in 1968 to the Mustang and continued to be offered in 1969. The now revised 302 cu in (4.9 L) Windsor engine had 210 hp. In addition, a number variety of performance packages were introduced that included names like the Mach 1, the Boss 302 and the Boss 429. The two Boss models were to homologate the engines for racing.

After a very disappointing 1968 racing season Ford designed a new engine specifically for F.I.A. Trans Am competition in 1969, the Boss 302. The engine was introduced on April 17, 1969. About 8,600 Boss 302 engines were built. The Boss 302 block was essentially the next generation of 289 High Performance hardware, but features a forged steel crankshaft, 4-bolt main caps, and screw-in freeze plugs. These modifications were developed as part of the 302 Tunnel Port design. Street versions used connecting rods similar to the 289 Hi-Po while the Trans Am version used heavier 7/16″ bolts.

The real magic of the Boss engines came from the canted-valve Cleveland cylinder heads. While the Boss 302 was normally considered a 302 with 351 Cleveland heads, these canted-valve heads were used first on the Boss before the rest of the Cleveland was developed. As fitted to the Boss, the heads feature steel spring seats, screw-in rocker studs, pushrod guide plates, and adjustable rocker arms. The Boss 302 and 351C-4V head casting were the same except for a minor difference in water passages. Camshafts were quite similar to the 289 Hi-Po. Due to the larger Cleveland-style heads, the Boss 302 weighs somewhat more than the normal 302, tipping the scales at 500 lbs.

The street version was conservatively rated at 290 HP @ 5800 RPM.During the ’69 Trans Am season the racing engines were putting out 470 bhp at a 9,000 rpm redline.

Learn more about the Ford Mustang 302 engine

Engine Basics

Year 1969 1969 Boss
bbl 2 barrel 4 barrel
Cylinders V8 V8
Power (hp) 210 hp @ 4,400 RPM 290 hp @ 5,800 RPM
Torque (lb/ft) 295 lb/ft @ 2,400 RPM 290 lb/ft @ 4,300 RPM
Compression 9.5:1 10.5:1
Displacement 302 cu / 4.9 liters 302 cu / 4.9 liters
Bore x Stroke 4.000 x 3.00 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
Boss 302 Valve Adj. Mechanical Hot lifter adjustment for the Boss 302- 0.025 Intake and Exhaust
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

Crankshaft Bearing Journal Specifications (302 Boss)

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 2.1222 – 2.1230
Oil Clearance 0.0015 – 0.0025
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 Ring Specifications (302 Boss)

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

302 302 Boss
Code Red 3.9984 – 3.3990 3.9968 – 3.9974
Code Blue 3.9996 – 4.0002 3.9980 – 3.9986
0.003 Oversize 4.0008 – 4.0014 3.9992 – 3.9998
Piston to Cyl. Bore clearance 0.0018 – 0.0026 0.0034 – 0.0042
Piston Pin Bore Dia. 0.9123 – 0.9126 0.9122 – 0.9125

Valve Specifications

Year 1969 1969 Boss
Seat angle 45 45
Face angle 44 44
Valve spring pressure lbs/inches 180 @ 1.23 315 @ 1.31
Valve spring installed height (in) 1 21/32 1 13/16
Stem guide clearance (in) – Intake 0.0010 – 0.0027 0.0010 – 0.0027
Stem guide clearance (in) – Exhaust 0.0015 – 0.0032 0.0015 – 0.0032
Stem Diameter (in) – Intake 0.342 0.342
Stem Diameter (in) – Exhaust 0.3415 0.3415

Tune Up Specs

Year 1969 “F” Code 1969 Boss
Spark Plug Autolite BF-42 Autolite AF-32
Plug Gap .032″-.036″ .035″
Dwell 24-29 (manual), 26-31 (automatic) 30-33
Point Gap .017″-.021″ .020″ both sets
Intake 1.773″-1.788″ 2.225″ -2.375″
Exhaust 1.442″-1.457″
1.647″-1.662″ (early 1969), 1.7075″-1.7125″
Carburetor Autolite 2300-A (2V) Automatic choke
Holley 4150-C (4V), manual choke
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