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The Pontiac Trophy 4 engine (also called the Indianapolis 4, [1] or Indy 4) is a 194.5 cu in (3.2 L) inline four-cylinder engine [2] produced by the Pontiac Motor Division of General Motors for model years 1961 through 1963. [3] Created from one bank of Pontiac's powerful 389 cu in (6.4 L) Trophy V8, [3] its only application was in the first ...
In 1963 Pontiac dropped the Buick division built 215 cu. in. aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389 cu in (6.4 L) Pontiac V8. It shared the 389's 3 + 3 ⁄ 4 in (95.3 mm) stroke, but its bore was 3.78 in (96.0 mm) for a displacement of 336.66 cu in (5.5 L).
The Tempest was the result of a decision by the Pontiac division to enter the compact car market following the success of the Chevrolet Corvair. [4] The division wanted to produce a clone of the Corvair, but instead GM gave Pontiac the lead to develop a new car in an interdivisional program coded named "X-100."
The Tempest also used an independent rear swing axle suspension similar to the rear-engine Chevy Corvair while the Buick and Olds compacts featured a conventional rear coil spring suspension. For 1963, Pontiac replaced the Buick-sourced 215 aluminum V8 with a Pontiac built 336 cubic-inch V8 as the top power option for the Tempest.
An optional Buick 215 cu in (3.5 L) V8, was not popular when it was available for 1961 and 1962 in the Tempest. For 1963, Pontiac replaced it with a new "326" that was actually 336 cu in (5.5 L) V8 with a bore of 3.78 and stroke of 3.75 (same stroke as the 389). It was based and shared parts with the 389, but an altered, reduced bore.
The Roto Hydramatic was used in all full-sized Oldsmobile models including the Dynamic 88, Super 88, Ninety-Eight and Starfire from 1961-1964 as well as the compact Oldsmobile F-85 from 1961-1963. Pontiac used the Roto Hydramatic from 1961-1964 on its shorter-wheelbase full-sized cars including the Catalina, Ventura and Grand Prix, but ...
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