Once you have reached the maximum recommended torque setting, go around one more time. I recommend that you use the 3 step torque technique where you torque down the bolts in three equal steps. If you use special bolts, follow the torque specifications provided by the manufacturer. Engine Basics YearĪll torque specifications provided in this table are those recommended by FORD. The SCJ engine came with a Holley 780 cfm carburetor rather than the Rochester Quadrajet, a mechanical lifter camshaft and adjustable rocker arms. Some Mustangs with the Drag Pack also included an external engine oil cooler, though of a different design than previously used. Both of these engines have the engine code C. It consisted of a 3.91 or 4.30 rear axle ratio with Traction Lock or a 4.11 ratio with a Detroit Locker rear. The 429CJ became a 429SCJ if the Drag Pack option was ordered. The 429CJ came with a Rochester Quadrajet four-barrel carburetor, and some early units had adjustable valve trains. You could describe the 429 as a large Boss 302.Īs equipped in the Mustang, the 429CJ came with four-bolt mains, forged rods and pistons, 11.3:1 compression ratio, a hydraulic cam, (similar to the Boss 429’s) very large ports and valves, and all 429CJs came with aluminum valve covers. The cylinder block was a variation of the 429/460 block, of which the Boss 429 was also based on the cylinder heads were similar to the 351 Cleveland in design. Wider, larger, and heavier, the 429 would not readily fit into the 1970 Mustang engine compartment, which is one of the reasons why the 1971 Mustang got bigger. The 429 belonged to the Ford 385 Engine Series and as such, no parts were interchangeable with the older 428. Although the 429s were available on any Mustang body style, the big engine was most often seen in the Mach 1, which was still the main Mustang performance model. With the 427 and 428 engines now history, the replacement 429 CJ engine was called for duty as the top Mustang engine. The engine output was increased to 375 hp and 450 lb-ft of torque, coming with a 3.91:1 or 4.30:1 rear axle ratio The 429 Super Cobra Jet (429SCJ) was fitted with a Holley 735 cu ft/min (20.8 m3/min) 4-bbl carburetor, larger mechanical camshaft, and a four-bolt main block. It had aluminum heads with extremely large free flowing ports, contoured exhaust manifolds, a high rise intake manifold to help it gain horses.įord offered the Super Cobra Jet version of the 429. The Boss 429 engine was offered late in 1969 and was rated at over 370 horsepower. Crankshaft Bearing Journal Specifications (Boss 429)ġ971 Mustang Engine Information – 428 cubic inch V-8 (7.0 L Super Cobra Jet V8) Ford 429 Super Cobra Jet.
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