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In 1969, Pontiac unveiled its Trans Am model Firebird, and since racing rules required engines of less than 5 L (305.1 cu in), Pontiac unveiled the 303 for racing models only, never available to the public. Bore and stroke were 4.125 in × 2.84 in (104.8 mm × 72.1 mm) 303.63 cu in (4,976 cc).
The engine had a remarkably low idle speed of 450 rpm with standard transmission and 375 rpm (while in drive) for the automatic; [5] a modern engine is usually tuned to a minimum 600-700 rpm. The electrical system was a 6-volt primary with a negative ground, and a conventional mechanical ignition , with the firing order 1-6-2-5-8-3-7-4.
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In spite of a GM unwritten edict against engines larger than 330 cu in (5.4 L) in intermediate cars, DeLorean (with support from Jim Wangers from Pontiac's ad agency), came up with the idea to offer the GTO as an option package that included a 389 cu in (6.4 L) engine rated at 325 or 348 hp (242 or 260 kW; 330 or 353 PS).
Optionally available at extra cost were higher-power versions of the 389 V8 with four-barrel carburetion rated at 283 horsepower (211 kW) with manual gearbox or 303 hp with Hydramatic, a 4-barrel carburetor version with a horsepower rating of 318 hp, or "Tri-Power" options with triple two-barrel carburetors and 330 hp or 345 hp (257 kW). [1]
The Iron Duke engine (also called 151, 2500, Pontiac 2.5, and Tech IV) is a 151 cu in (2.5 L) straight-4 piston engine built by the Pontiac Motor Division of General Motors from 1977 until 1993. Originally developed as Pontiac's new economy car engine, it was used in a wide variety of vehicles across GM's lineup in the 1980s as well as supplied ...
Tri-Power was the name for an arrangement of three two-barrel carburetors [1] installed on large performance V8s offered by the Pontiac Division of General Motors in the late 1950s and 1960s. [ 2 ] Three individual Rochester 2G carburetors were arranged inline on the intake manifold, the center one operating normally and the outer two acting as ...
Prior to developing its own engines, smaller GMC trucks used the Pontiac V8 engine. They used the Pontiac 287-cubic-inch (4.7 L) engine for 1955 and 316-cubic-inch (5.2 L) engine in 1956, but advertised the engines as the "GMC 288" and "GMC 316". They used Pontiac's 347-cubic-inch (5.7 L) in 1957.
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