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The upper and lower intake manifold is now aluminum on the naturally aspirated models. Intake ports are mildy enlarged; 1.83 in (46.5 mm) intake valves (instead of 1.8 in (45.7 mm) as on Series II) and 1.52 in (38.6 mm) exhaust valves were introduced in 2003 engines, just before switching to Series III.
Buick also released two other model types, the LSE and the GSE. The LSE stayed with the 200 hp (149 kW) engine with upgrades and the GSE stayed with the 240 hp (179 kW) supercharged engine with upgrades. Also, in 2000 Buick came out with a concept GSX that had an intercooled 3.8 L, but was supercharged rather than turbocharged.
The LN3 was used from 1988 until 1990. For the last three model years Buick used the L27 iteration with sequential, tuned port fuel injection (TPI), which gained a few more horsepower and more mid-range torque from a new, two-piece intake manifold with longer runners. Power crept up to 170 hp (127 kW) at 4,800 rpm, torque was up to 220 lb⋅ft ...
A unique intake manifold that used the 48 mm (1.9 in) twin-bore throttle body from the 5.7L TPI Corvette engine was used on the engine's top end. [9] The turbocharged 4.3 L (262 cu in) was last used in the GMC Typhoon in the 1993 model year. The engine produced 280 hp (209 kW) at 4400 rpm and 360 lb⋅ft (488 N⋅m) of torque at 3600 rpm.
It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
The 322 Fireball V8 in a 1956 Buick Century. Buick's first generation V8 was offered from 1953 through 1956; it replaced the Buick straight-eight.While officially called the "Fireball V8" [1] by Buick, it became known by enthusiasts as the "Nailhead" for the unusual vertical alignment of its small-sized valves (Originally it was known to hot-rodders as the "nail valve", because the engine's ...
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