1965 Mustang Engine Information & Specs – 260 Cubic Inch V-8

The first V8 installed in the Mustang

1965 Mustang Engine Information – 260 cubic inch V8

This was the first V8 installed in the Mustang, its block was painted black (paint code 903), heads were blue (paint code 963), and the valve covers and air cleaner were light blue (paint code 958).

It was an enlarged version of the previous 221 CID V8 that Ford used in previous cars and the 260 had 164 horsepower. In 1962, it was used in the Shelby Cobra, the Mercury Comet and the Ford Fairlane. Then in 1963, it was used in the Shelby Cobra, the Mercury Comet, the Ford Fairlane, the Ford Galaxy, and the Mercury Meteor. In 1964, it again saw service in the Shelby Cobra, the Mercury Comet, the Ford Fairlane, and the Ford Falcon. Finally, the little v8 was installed in the newly introduced Mustang in April 1964 and was offered only until August.

The 260 was an overhead valve 90 Degree V8 engine and a good performer. It was easy to add modifications and make good horsepower. Carroll Shelby used the little 260 in his first Cobras and really kicked butt. The street version ran on regular leaded gasoline. Intake manifolds were cast in two variations, the street version which was cast iron and the Shelby performance version cast out of aluminum. The Shelby version also enjoyed solid lifters while the street version used hydraulic lifters.

Carburetion was achieved through one of the following carburetors: Autolite 2100 (2V)with an automatic choke or a Autolite 4100 (4V) using a manual choke.

The engines used a single point vacuum advance distributor for the standard engine. However the Shelby Cobra was equipped with a dual point mechanical advance distributor. However as Chevy tried to catch up with ford, they rumored to use a 283 CID engine and the little 260 was not enough engine to beat the 283 so Ford upped the game with the 289 starting with the late 1965 Mustang models.

Engine Basics

Year 1964 1/2 (“D” Code) 1965 (“F” Code) Cobra
Cylinders 8 8 8
Displacement 260 cu / 4.3 liters 260 260
Power (hp) 164 hp @ 4,400 RPM 164 hp @ 4,400 RPM 260 hp @ 5,800 RPM
Torque (lb/ft) 190 lb/ft @ 2,400 RPM 190 lb/ft @ 2,400 RPM 269 lb/ft @ 4,500 RPM
Compression 8.7:1 8.7:1 9.2:1
Bore x Stroke 3.80″ X 2.87 3.80″ X 2.87″ 3.80″ X 2.87″

Engine Specs (206 cid V8)

Spark Plugs BF-42
Oil filter
Gas Filter
Air Filter
PCV
Oil 5 quarts of 10W30 or 10W40
Oil Pressure 35 – 55 PSI
Points .014″-.016″ Gap and ? Dwell at 600 RPM
Timing 6 Degrees BTDC Manual & 10 Degrees BTDC Automatic
Valve size Intake 1.59, Exhaust 1.39
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 16 inches at idle
Warm Idle Manual Trans 575-600 RPM
Warm Idle Auto Trans 475-500 RPM
Carburetor CFM Autolite 2100
Bore and stroke 3.800 X 2.870
Compression 8.7:1 (130 – 170 psi @ cranking speed) and 9.21:1 (Shelby Cobra)
Compression pressure 130-170 psi
Combustion chamber 53.0 closed combustion chambers
HP and Torque 164 hp at 4400 RPM and 258 ft/lbs torque at 2200 RPM
Taxable HP 46.2
Distributor Rotation Counter-Clockwise
Firing order 1 – 5 – 4 – 2 – 6 – 3 – 7 – 8
Weight Long block 460 Lbs

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 12-15
Exhaust manifold bolts 15-20
Harmonic damper 70-90
A/C Compressor mounts
Engine fan 15
Motor mounts to engine
Bellhousing bolts 25
Trans to Bellhousing
Flywheel to Crankshaft 75-85
Oil pan bolts 15
Valve cover bolts
Carburetor mount bolts
Oil Pump 25
Spark plugs
Trans. inspection plate
Water pump bolts 20
Rocker arms 20
Cam bolt upper gear 40
Clutch pressure plate 35

Crankshaft Bearing Journal Specifications

Main Bearing Journal (inches)

Journal Diameter
Oil Clearance
Shaft end play
Thrust on number

Connecting Rod Journals

Journal Diameter
Oil Clearance
Side clearance

Piston Ring Specifications

Comp Ring Width

Top 0.0774 – 0.0781
Bottom 0.0930 – 0.0940

Ring side clearance

Top 0.0019 – 0.0036
Bottom 0.001 – 0.004
Oil ring Snug

Ring gap width

Top 0.010 – 0.032
Bottom 0.010 – 0.032
Oil Ring 0.015 – 0.067

Piston Specifications

Code Red 3.7976 – 3.7982
Code Blue 3.7988 – 3.7994
0.003 Oversize
Piston to Cyl. Bore clearance 0.0021 – 0.0039
Piston Pin Bore Dia. 0.9124 – 0.9127

Valve Specifications

Year 1965
Seat angle 45
Face angle 44
Valve spring pressure lbs/inches 161 – 177 @ 1.39
Valve spring installed height (in) 1 3/4 – 1 25/32
Stem guide clearance (in) – Intake 0.0008 – 0.0025
Stem guide clearance (in) – Exhaust 0.0018 – 0.0035
Stem Diameter (in) – Intake 0.3100 – 0.3107
Stem Diameter (in) – Exhaust 0.3090 – 0.3097
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