1972 Classic Cars for Sale
SAE net ratings arrive, the 454 drops to 270 hp on paper, but the engines didn't shrink.
1972 is the year that looks worse than it was. The industry switched from SAE gross horsepower ratings to SAE net ratings, which measure power with all accessories installed and the exhaust system in place. The result was a bloodbath on paper. The Chevrolet 454 went from 365 hp to 270 hp. The Pontiac 455 HO went from 335 to 300. None of those engines lost power. The measurement changed. Collectors who understand this aren't scared of 1972 cars.
The real performance erosion was happening, though. Compression ratios were down, emissions equipment was going on, and the manufacturers were starting to detune for reliability on low-octane fuel. The genuine article was still available if you ordered right. A 1972 Chevelle SS with the LS5 454 was still a fast car. A 1972 Pontiac Firebird Formula 455 HO was still a legitimate performance machine.
Production numbers were falling across the segment. Buyers were getting squeezed by insurance rates and gas prices that were beginning to climb. The Dodge Charger was still a handsome car. Ford had the Mustang Mach 1 with the 351 Cobra Jet. These aren't the peak muscle cars, but they're the last of the real ones before the smog equipment gets serious.
- The automotive industry transitioned from SAE gross to SAE net horsepower ratings for 1972 model year, making all power figures appear to drop dramatically even when actual output was similar to 1971.
- Chrysler discontinued the 426 Hemi and the 440 Six Pack option for most applications after 1971, leaving the standard 440 four-barrel as the top Mopar street engine for 1972.
- Chevrolet's Camaro Z28 was discontinued after the 1969 model year and did not return until 1973, leaving a gap in Chevrolet's pony car performance lineup for 1972.
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Market: 1972 muscle cars trade at a discount to comparable 1970 and 1971 cars, which represents opportunity for buyers who do their homework on the horsepower rating change. Solid 1972 Chevelle SS 454 or Firebird Formula 455 cars run $25,000 to $60,000, with condition and documentation driving the spread.
Buyer's note: Confirm the engine option codes on the trim tag and cowl tag, because the SAE net rating confusion leads some sellers to misrepresent the actual engine installed, and a 400 cubic-inch car sold as a 454 is a common problem.