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http://en.wikipedia.org/wiki/Chevrol...gree_V6_engine
Chevrolet 90-Degree V6 engine
The Chevrolet 90° V6 family of engines began in 1978 with the Chevrolet 200 cid (3.3 L) V6 as the base engine for the all new 1978 Chevrolet Malibu. This engine family is still produced today, as the 4.3 L V6 engine used in Chevrolet and GMC trucks and vans.
These engines have a 90° vee block with 12 valves activated by a pushrod valvetrain. All engines have cast iron blocks and cylinder heads. The engines are based on the Chevrolet Small-Block engine, and the V6 is formed by the removal of the #3 and #6 cylinders. The V6s share the same 4.4" bore spacing and 9.025" deck height as the V8 engines. Many parts are interchangeable between the 90° V6 and the small block V8 including valvetrain components, bearings, piston assemblies, lubrication and cooling system components, and external accessories.[1] The 90-degree V6 engine uses the same transmission bellhousing pattern as the Chevrolet small-block V8 engine. The oil pan dipstick is located on the passenger side above the oil pan rail; this design was phased in on both the V6-90 and Small Block Chevrolet assembly lines sharing the same casting dies. All the engines use a 1-6-5-4-3-2 firing order.[2] The engines in this family are longitudinal engines, and have only been used in rear-wheel drive cars and trucks.
3.8L (229 CID)The 229 cid engine was first introduced for the 1980 model year and was produced until 1984. This engine replaced the 250 cid in fullsize Chevrolets and Camaros as the new base V6. Additionally, the intermediate Chevrolet Malibu and Monte Carlo also used the 229 cid as a replacement for both the 200 cid V6, and the 231 cid Buick V6. Both the 231 cid Buick V6 and the 229 cid Chevrolet V6 are 90 degree V6 engines, and both are often referred to as the 3.8L V6. These engines should not be confused as being the same, and are completely unique engine designs.
The 229 cid has a 3.736" bore and a 3.48" stroke, identical to the Chevrolet 305 cid V8 engine. The 229 cid used the same 2.45" main bearing and 2.10" rod bearing diameters as the 200 cid V6 engine. Also like the 200 cid V6, the 229 cid used the same crankshaft with the 18 degree offset throws and the same 5.7" connecting rods with 0.050" narrowed ends. It came equipped with 1.84" intake valves and 1.50" exhaust valves. The 229 cid V6 was only equipped with a 2-barrel carburetor. For 1980 the 229 cid used a mechanical Dualjet. From 1981 - 1984 the electronic Dualjet was used along with the GM's CCC (Computer Command Control) system. The 229 cid was rated between 110 and 115 hp (86 kW).
Year Horsepower Torque Bore and Stroke Carburetor Compression Ratio
1980 115 hp (86 kW) @ 4000 rpm 175 lb·ft (237 N·m) @ 2000 RPM 3.736" x 3.48" 2-BBL M2ME 8.60:1
1981–1982 110 hp (82 kW) @ 4200 rpm 170 lb·ft (230 N·m) @ 2000 RPM 3.736" x 3.48" 2-BBL E2ME 8.60:1
1983–1984 110 hp (82 kW) @ 4000 rpm 190 lb·ft (258 N·m) @ 1600 RPM 3.736" x 3.48" 2-BBL E2ME 8.60:1