One of the finalists for CARS Magazine’s 1966 Top Performance Car honors was the ’66 OLDS TRI-POWER 4-4-2: SERIOUS SUPERCAR!

’66 OLDS TRI-POWER 4-4-2: SERIOUS SUPERCAR

In 1966, Olds Engineers in Lansing finally developed a big-engined midsize car to compete seriously with Pontiac’s GTO. After revealing the latest 4-4-2 with a four-barrel 400/350, they upped the ante with a late-arriving Tri-Carb version conservatively rated at 360 horsepower. It was Oldsmobile’s first use of three-two-barrel induction since the legendary 1957-1958 371-cube J2 Rocket V8s, rated at 300 and 312 horsepower respectively.

We found that an L69-option Tri-Carb 4-4-2 with four-speed and 3.90 Anti-Spin gearing was quicker and faster than the 360-horsepower Tri-Power GTO we tested for the March 1966 Hi-Performance CARS.  GTO styling was refreshed in 1966 and it became a distinctive model series, no longer a Tempest option. The best time we ran with the GTO was 100 mph in 14.50 seconds, compared with an L69 Olds’ 13.80s and approximately 105 mph.

 Oldsmobile engineers in Lansing worked on the L79 W-30 engine project in late 1964 and 1965, and Tri-Carb packages first surfaced on ’65 4-4-2 Mules.

’66 OLDS TRI-POWER 4-4-2: SERIOUS SUPERCARThe Lansing Engineering facility was down the road from Demmer Tool & Die, a GM supplier. There was a lot of “information” sharing between Olds and Demmer drag racing engineers. Demmer raced a Tri-Carb 4-4-2, RECTIFIER-2, and worked closely with Oldsmobile. In 1968 Demmer built the 455-inch Hurst Olds. Unlike GTO Tri-Power with vacuum-operated linkage opening the end two Rochester 2GC carburetors, the ’66 OLDS TRI-POWER 4-4-2: SERIOUS SUPERCAR L69 Tri-Carb utilized smoother, progressive mechanical linkage.

With a choice of Anti-Spin gearing up to 3.90 and dealer-installed 4.11 or 4.33 gears, plus close or wide-ratio Hurst-shifted four-speeds, the Tri-carb 4-4-2 was a serious Supercar. Taking it up a notch, it was available with a W-30 option that didn’t change the factory power rating, but unquestionably improved quarter-mile performance. Key W-30 ingredients included a chromed Tri-Carb air cleaner with four-inch hoses ducting fresh air from front bumper openings, a high-lift, 308-degree-duration camshaft, and relocation of the battery to the trunk. The majority of W-30 engines were in base model F-85 4-4-2 Club Coupes.

’66 OLDS TRI-POWER 4-4-2: SERIOUS SUPERCAR

For more information on the ’66 OLDS TRI-POWER 4-4-2: SERIOUS SUPERCAR, and all midsize products for 1966, check out OVER-DRIVE Magazine @ https://over-drive-magazine.com/2023/12/30/1966-oldsmobile-mid-size-cars-fact-sheet/

For complete coverage of the 1960s-1970s Motown Musclecar scene, add a copy of DAY ONE to your library, https://www.amazon.com/Day-One-Automotive-Journalists-Muscle-Car/dp/0760352364/ref=sr_1_1?s=books&ie=UTF8&qid=1493561421&sr=1-1&keywords=Day One by Martyn L. Schorr