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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."
In 1967, Pontiac moved on to a technologically simpler nodular cast iron (invented in late 1940s) crankshaft, which they continued to use until the Pontiac V8 engine was discontinued in 1982.The SD racing program was the source of factory supplied performance items such as 4 bolt main bearing caps and windage trays to reduce friction from ...
A single overhead camshaft (SOHC) design was introduced by Pontiac in the 1966 model year as the standard engine in the Tempest. Offered also in 1967, the 230 cu in (3.8 L) OHC 6 shared internal dimensions with the overhead valve Chevrolet straight-6 engine it was based on, [ citation needed ] but had unique cast iron block and head castings.
The Pontiac GTO is a front-engine, rear-drive, two-door and four-passenger automobile manufactured and marketed by the Pontiac division of General Motors over four generations from 1963 until 1974 in the United States — with a fifth generation made by GM's Australian subsidiary, Holden, for the 2004 through 2006 model years.
Replacing the Pontiac-built OHC six-cylinder as the base engine for Tempest, LeMans, and LeMans Sport was Chevrolet's 250 cubic-inch straight-six engine. V8 offerings included 350 and 400-cid options with 2-barrel carburation and a 330 hp (246 kW) 400-cid 4-barrel carbureted engine with dual exhausts. The four-barrel 350 HO was discontinued.
The Trophy 4 engine is a short-stroke, 45-degree inclined [4] inline four created from the right bank of the 389 V8 for the debut of the Tempest in 1961. Its 194.43 cu in (3.2 L) displacement is precisely half of the 389, with an identical bore and stroke of 4 + 1 ⁄ 16 in × 3 + 3 ⁄ 4 in (103.2 mm × 95.3 mm).
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The front and rear track of the 1961-62 Pontiac was reduced to 62.5 in (1,590 mm) front and rear. The 1961 Pontiac was advertised as "all Pontiac...on a new wide track." All engines were again 389 cu in (6.4 L) V8s as in previous years, now called "Trophy" engines. rather than "Tempest" (including the larger 421ci "big bore" engine).