Introduced in 1969, the 155 horsepower 6 cylinder was needed because of the Mustang’s increase in size. The 200 cubic inch six although still offered was way underpowered to handle the new Mustang. However, in my opinion, to really power a Mustang always required an 8 cylinder engine and buying a 6 (or 4 cylinder in later years) was like buying 3/4 or 1/2 an engine. But you didn’t get a discount from the dealer for the part of the engine they forgot to install.
250 cu / 4.1 liters
99 hp @ 3,600 RPM
184 lb/ft @ 1,600 RPM
Bore x Stroke
3.682 x 3.910
Engine Specs (250 cid inline 6)
35 – 55 PSI
Gap and Dwell at xxx RPM
6 Degrees BTDC Manual & 12 Degrees BTDC Automatic
E I E I E E I E I I E Front to rear
17 inches at idle
Warm Idle Manual Trans
Warm Idle Auto Trans
Bore and stroke
3.500 X 2.940
9.1:1 (155 – 199 psi @ cranking speed)
HP and Torque
101 hp at 4400 RPM and 158 ft/lbs torque at 2400 RPM
1 – 5 – 3 – 6 – 2 – 4
Clutch information: for the 3 spd, 9″ diam. 6 Springs, Pressure plate orange cover, purple springs, aluminum stripe. Disc is 9″ diameter, 6 springs, Blue with blue springs.
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.