The 429CJ option was available for the 1971 model year only. There were 448 cars built, 401 hardtops and 47 convertibles. To date (3/18) we have 94 cars registered, 62 hardtops, and 32 convertibles. The 429CJ option was offered in two guises: J-CODE = RAM-AIR and C-CODE = NON-RAM AIR. Horsepower and torque figures were quoted the same for both options: 370HP and 450FT/LBS. The 429-Cobra-Jet Registry was established to document and track all 429CJ optioned Cougars. 429CJ DISTINGUISHING FEATURES:•C or J in VIN •All body styles were available with the 429CJ option including XR7 / Std convertibles and hardtops and the Cougar GT. •All cars featured a dress up engine kit featuring "Ribbed" aluminum valve covers, bright dipstick, oil filler cap, radiator cap and air cleaner cover. NOTE: bright air cleaner cover available on non ram-air equipped cars only. •All engines featured 4 bolt main bearing blocks. •Hurst 4 speed or C6 automatic transmissions were required options (no 3 speeds). •All 4 speed cars have rev limiters, C6 transmissions were a special unit with additional clutch plates, cast iron tail-shaft and "R" servo. •All cars had competition suspension. Larger front sway bar, rear sway bar, heavy duty shocks, staggered in the rear. •Power steering equipped cars had variable ratio 20.2:1 and a power steering cooler on 3:50 rear end ratio cars only. Power steering oil cooler were included on some but not all 3:25 rear end ratio cars. •Power brakes were a required option. All cars were equipped with 27" heavy duty radiators. •All cars were equipped with a 720CFM Rochester/Quadrajet carb. Note: the 780 Super Cobra-Jet was not offered as a production option. "Drag pak" and "Super Drag pak" were not offered as production options. •Functional hood scoop was a feature of the Ram-Air option, all Cougar GT models have hood scoops but functional only on 429 Ram-Air motor option. •All cars were equipped with dual exhaust. •All cars were equipped with heavy duty battery (Group 27F). •Rear end ratios were 3:25 or 3:50 only, traction lock was optional.•All cars had 31 spline rear axles. •All air conditioned cars required the 3:25 ratio. •Air conditioning was not offered as a production option on convertibles. •Tire/wheel options were 14x7 with either F70X14 or F70X14RWL traction tires. 15X7 wheels with hub cap and trim ring and F60X15RWL traction tires were an option. •All paint and interior codes were available.