An Eaton blower boosts horsepower to 205. 1991 - L67 supercharged version of the 3800 appears.Also, a one-piece rear crankshaft oil seal was offered in some 3800 engines to reduce oil leaks. 1990 - The intake system was upgraded to Tuned Port Injection for more horsepower and torque.The cast iron camshaft was replaced with a steel camshaft, thinner, low-tension piston rings were added to reduce friction even more, and the mechanical EGR valve was replaced with an electronic digital EGR valve to reduce NOx emissions. The block casting was revised and a balance shaft added to dampen vibrations. 1988 - Buick now dubbed the engine the 3800.FWD versions also got new cylinder heads with pedestal-style rocker arms, and a needle bearing thrust washer for the camshaft. Some FWD versions of the 3.8L V6 (VIN 3) were offered with roller lifters. The deck height of the block was also reduced 0.035” to accommodate thicker composition-style head gaskets. 1986 - The flat tappet lifters were upgraded to roller lifters to reduce internal engine friction, and sequential fuel injection was also added for improved performance, fuel economy and emissions.The head bolts also changed to non-reusable torque-to-yield bolts. The number of bolts on the oil pan was also increased from 14 to 20 to reduce oil leaks. 1985 - The engine was refitted with a single serpentine belt to drive its accessories.This was also the first year for a front-wheel drive (FWD) version of the 3.8L V6. Also a new camshaft with a larger base circle and 0.015” shorter pushrods were added. 1984 - Direct fire distributorless ignition and electronic multiport fuel injection were added.Also, a smaller displacement 3.0L version of the 3.8L V6 with a shorter stroke crankshaft was built for GM FWD cars. 1982 - 180 hp version of the turbocharged 3.8L V6 offered in Regal T-Types and Grand National.1981 - Stronger connecting rods and a revised harmonic balancer and flywheel were added.1980 - Larger 4.1L version of 3.8L engine offered with bigger 3.965” pistons.1979 - The engine gained some horsepower with improved cylinder heads (larger valves and ports).1978 - Turbocharged version of the 3.8L V6 offered in the Buick Regal and LeSabre.1977 - Buick changed to an “even-fire” offset-pin crankshaft to smooth out the V6 engine.Over the years various improvements were made to upgrade engine performance. It also had an “odd-fire” crankshaft, which produced some idle shake and vibration. ![]() ![]() The 3.8L engine shared the same 3.8” bore size as the Buick 350 V8. The engine was based on an earlier 198 cu. The first Buick 3.8L was offered in the 1975 model year Skyhawk, Apollo, Century and Regal. Like the small block Chevy V8, this engine has undergone many changes over the years to keep it abreast of changing consumer expectations and emissions regulations. 3.8L V6 engine has had a production run lasting more than 30 years.
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