Editing Buick V6 engine (section)

====LD5====
[[File:1978 Buick 3.8 litre turbo engine in a Regal.jpg|thumb|The original, carbureted turbocharged LD5 from a 1978 Regal Sport [[Coupé]]]]
In 1978, GM began to market the 231 as the '''3.8 liter''' as [[metric engine (American expression)|metric engine]] sizes became common in the [[United States]]. The ''[[Regular Production Option|RPO Code]]'' was '''LD5''', though California-emissions versions were called '''LC6'''. Starting in 1979, the engine was used in the [[front-wheel drive]] [[Buick Riviera]], though still with a longitudinal mounting. Larger valves and better intake and exhaust boosted the power output for 1979.

A [[turbocharged]] version was introduced as the pace car at the 1976 [[Indianapolis 500]], and a production turbo arrived in 1978. The turbo 3.8 received [[sequential fuel injection]] and a [[wasted spark]] [[Distributorless Ignition System]] in 1984. In 1986, an air-to-air [[Garrett AiResearch|Garrett]] [[intercooler]] was added and the ''RPO Code'' became ''LC2''. The LC2 engine has a [[Bore (engine)|bore]] and [[Stroke (engine)|stroke]] of {{cvt|3.8x3.4|in|1}}. The [[horsepower]] ratings for 1986 & 1987 were {{cvt|235|and|245|hp|PS kW|0}}, respectively. The limited production GNX benefitted from additional factory modifications such as a [[ceramic]] turbocharger, more efficient Garrett intercooler, low restriction [[exhaust system]] and revised programming which resulted in a {{cvt|300|hp|PS kW|0}} factory rating.

The turbocharged 1987 Buick Regal Grand National GNX was called America's quickest automobile, and the model continues to be collected and appreciated today.

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|title      = '''Applications''':
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|bodystyle  = text-align:left;
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* 1978–1987 [[Buick Regal#Grand National, Turbo-T and T-Type|Buick Regal Sport Coupe, T-Type, Grand National, and GNX]]
* 1978–1980 [[Buick LeSabre]] Sport Coupe
* 1979–1980 [[Buick Century]] Turbo Coupe & Sedan
* 1979–1985 [[Buick Riviera]] S-Type, T-Type and less than 100 Convertibles
* 1980–1981 [[Chevrolet Monte Carlo]] Turbo
* 1989 [[Pontiac Firebird Trans Am|Pontiac Trans Am Turbo]] ''20th Anniversary Edition''
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