22 Though some claim the 428 CJ actually made in excess of 400 hp, we observed 365.1 hp at 4,800 rpm, almost 10 percent more than advertised. Mixing SCJ and CJ parts can cause severe balance problems. So the question remains, how much horsepower does a stock 428 CJ really deliver? I want to register an account for free right now! The big difference was the price (at $622, the 427 cost $188 more than the $434 428 CJ), transmission availability (the 427 was only teamed with the C6 automatic), carburetors (the 427's single Holley four-barrel rated 600 cfm, 135 less than the 428 CJ), and rated output. The 428 also got a single snorkel air cleaner and had a Holley 735 cfm carburetor. There was some overlap of the C and A markings on the rear block face which means many early CJ's have the A on the block while many police and pasenger 428 engines have the C marking. Unless specifically noted this comparison does not include the parts that are unique to the 428 Super Cobra Jet engine. The 428 Cobra Jet powered some of the fastest Ford Muscle Cars from 1968 to 1970, over nine Ford and Mercury models. Ford introduced the Mach 1 Mustang in 1969, creating an instant smash hit that outsold the previously popular GT by 67,062 units shuttering the GT model at the end of the model year. We have 2 blocks here-both are 428s but one has some additional webbing on the main bearings. The Ford Cobra Jet and Super Cobra Jet were introduced in 1970, and they were improvements over the 428s. Common to both were vital details such as camshafts, intake manifolds, valve and port sizes, and compression ratios. The 428CJ also used a superior cast iron intake and better exhaust manifolds. Cyclone CJ comes with four-speed stick competition handling package, wide-tread fiberglass belted WSW tires, blackout grille, hood stripe, all-vinyl cockpit, low-restriction dual pipesall standard. The basic strength of the Super Cobra Jet engine is in a more durable reciprocating assembly (crank, rods, pistons, wrist pins, flywheel/flexplate, and harmonic balancer) that was designed to withstand the higher RPM requirements of drag racing.
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