The 429 CJ and SCJ
Both the CJ and the SCJ came in two Ford engine codes. One being the C-Code, and the other the J-Code. Both are four-bolt main bearing blocks, topped with high compression, canted valve cylinder heads, to accommodate very large intake and exhaust valves, huge cylinder ports, and other high output features.
As with the 428 CJ and SCJ in the 1968 1/2 to 1970 Mustang, the 429 also came in improved performance Cobra Jet and Super Cobra Jet configurations, and also had a version of it's own Ram Air system.
But since both the 429 CJ, and the 429 SCJ had two different but same codes, a person would have to look closely to see if it was in fact a Drag-Pac car or not. Confusing? You bet. Lets spell it out in
digits. The C-code came two ways (CJ - NON-Ram Air), and (SCJ - NON-Ram
Air). Then we have the other J-code (CJ-R Ram Air, SCJ-R Ram Air). It's
easier to say the C stood for non-ram air equipped, and the J-code for ram air
equipped. But the differences don't stop there. Go to the Megasite for details.
Drag-Pac option:
There were only two rear end gear ratios available for the Drag-Pac option, the "V"
Traction-Lok 3.91's, or the "Y" for Detroit-Locker 4.11's. The other components
of the 1971 Drag-Pac option included the following engine modifications: * A long
duration, high lift camshaft with mechanical lifters; * Modified crankshaft; * Cap-
screw connecting rods; * Modified flywheel; * a modified vibration damper; * and
a duel point distributor.
You can see then that the 429SCJ has solid lifters, while the CJ has hydraulic -
which is the main difference cited all the time between the two engines. The 429 block itself was designed first and foremost for racing, and then it was put into regular production, in various states of tune. For Ford, this was a 180-degree difference from the 428, which was first designed to power the big Ford and Mercury full-size cars, and then adapted for high output street performance. The 429 gave the Mustang a quantum leap forward in performance, but were not to last do to new Federal rules and smog restrictions. Even though the CJ version was available for other Ford vehicles that year (Cougar, Torino), the SCJ version was only available in the Mustang, and was discontinued after it's one and only production year.
Another easy way to tell if your C or J code car was a CJ or a SCJ was to check the number of fuel lines. Look in the engine bay, drivers side rear compartment. Just near the firewall, but on the wheel well itself. Are there one or two fuel lines there? If one line, your car is a SCJ, if two lines, it's a CJ. Lets state why this is. The Rochester Quadrajet required a fuel return line for unspent fuel, and the Holley did not. Yes this is a simplified description, but accurate.
Also note, the there were no CJ cars with the drag-pac option. The Drag-pac was the SCJ version.
Lets look at the this series Mustang itself.
The class of 1971 was groomed to be the best and brightest ever, and in many ways it was. This body style was a radical change to say the least, but in terms of size, consider these 1970/1971 comparisons: Wheelbase was now 109", up only one inch from 1970. Length was increased by 2.1", and the wider stance up front measured 61.5 inches, exactly 3.0 inches more than the previous year. And, as for the lower stance, the car was just a half inch closer to the ground: It was the radical 60-degree windshield slope, greater by 5.50- degrees from 1970 that that made the car look that much more sleeker. The main point is that Ford was still building the horsepower theme, for the top pony car image out of Detroit, and this class graduated to the top two, again beating out Camaro, Firebird, Javelin, ‘Cuda’, and Challenger for the number one sales position, and this fact alone speaks volumes on the popularity of the 1971 Mustang. The class of 71 was a success, even if it stands alone…
Alone? Yes, and that is due to the climate of the early ‘70s. No gas crisis yet, but the government wanted the lead out, and with the switch to low lead and finally unleaded (by 1975), we entered the smogger era. 1971 was the final year for the big-blocks, and for
high compression, with c.r.’s still up and over that magic 10.0:1 mark - in fact, the 429 versions had 11.3:1. But the whole new Mustang series was built around a performance theme - more than any other Mustang back then. - so it was a sad passing when horsepower went out to pasture, leaving the Mustang a cosmetic supercar.
So the class of 71 will forever remain special. No model of the mustang before has had such radical performance styling and such a large regular production V8 as an option. On the street, the 429 CJ and SCJ rivaled anything ever put into production in a Mustang for brute power.