In this article we will review the GM 5.7LG SGI Engine Specs. The General Motors 5.7LG SGI engine is an in-line, six-cylinder gasoline engine manufactured in the 1960s and early 1970s. The engine was manufactured by General Motors and featured a single barrel carburetor. The 5.7LG was used in the GMC 1500 trucks and vans, along with the Chevrolet K20 and K30 trucks, as well as several utility vehicles.”
The General Motors 5.7LG engine is an in-line, six-cylinder gasoline engine manufactured in the 1960s and early 1970s.
The General Motors 5.7LG engine is an in-line, six-cylinder gasoline engine manufactured in the 1960s and early 1970s. It was used in GMC pickup trucks, full-size passenger cars and station wagons. The 5.7L designation refers to the displacement of a particular cylinder bore measurement, which measures how large individual cylinders are (in terms of cubic inches). The “G” in 5.7LG denotes that this particular engine was designed for use with a turbocharger. This engine appeared in three different variations:
- 5.7L engine with single overhead camshaft (SOHC) intake valves and dual exhaust valves
- 5.7L engine with double overhead camshaft (DOHC) intake valves and dual exhaust valves
- 5.7L engine with double over head camshaft (DOHC) intake valves and single exhaust valve
The engine was manufactured by General Motors and featured a single barrel carburetor.
The 5.7L LG SGI V8 engine was manufactured by General Motors and featured a single barrel carburetor. It was used in GMC 1500 trucks and vans, along with the Chevrolet K20 and K30 trucks, as well as several utility vehicles.
The engine was used in the GMC 1500 trucks and vans, along with the Chevrolet K20 and K30 trucks, as well as several utility vehicles.
The engine was used in the GMC 1500 trucks and vans, along with the Chevrolet K20 and K30 trucks, as well as several utility vehicles. It has been replaced by the 5.3L LM7 or 6.0L LS2 V8 engines.
The SGI was called a “stroker” since it had a 4 inch stroke crankshaft (which means that the piston travels upward on its cylinder bore). This is different from most other GM small-block engines’ 3-inch stroke crankshafts which made them ideal for racing applications where high rpm operation was required.
The 5.7LG has a bore of 4.17 inches, stroke of 3.53 inches and compression ratio of 8.3 to 1.
The 5.7L GM SGI engine is a V8 that has a bore of 4.17 inches, stroke of 3.53 inches and compression ratio of 8.3 to 1 (the amount of air that can be squeezed into the cylinder). The engine’s bore is the diameter of its cylinders, while stroke refers to how far up and down each piston goes as it moves inside the cylinder — a longer stroke allows more room for expansion when air is compressed by heat or combustion pressure inside the chamber. A higher compression ratio means you’ll need less fuel to get your car running smoothly and efficiently; in contrast, engines with lower compression ratios require higher octane fuel because they have fewer molecules per cubic inch that can expand when ignited by sparks from spark plugs under high temperatures produced by burning gasoline vapors.
The engine is a low-emissions vehicle, or LEV1, engine, which means that it meets California’s emissions guidelines for the year 2000.
The GM 5.7LG SGI engine is a low-emissions vehicle, or LEV1, engine which means that it meets California’s emissions guidelines for the year 2000. This designation makes it one of the most environmentally friendly engines available today.
LEV1 engines are designed to meet EPA Tier 1 emission requirements and must pass an additional 200-mile durability test to ensure durability through 150,000 miles of service life or 100% duty cycle (this means no rest between shifts).
It is designed for use with unleaded gasoline only.
The 5.7LG engine is designed for use with unleaded gasoline only. If you use leaded gasoline, the engine will not run or will run poorly. It is illegal to use leaded gasoline in a LEV1 engine.
Takeaway:
The GM 5.7 LG SGI is a low-emissions vehicle, or LEV1 engine. It’s designed for use with unleaded gasoline only and is not approved for use with diesel fuel, E85 ethanol (85 percent ethanol/15 percent gasoline), or any other fuels.
The GM 5.7 LG SGI meets the following standards:
- United States Environmental Protection Agency (EPA) Tier 2 Bin 3 emissions requirements
- California Air Resources Board (CARB) California LEV II emissions requirements
Conclusion
The General Motors 5.7LG engine is a six-cylinder, in-line engine that was manufactured by the General Motors Corporation. The engine was used in several vehicles produced by Chevrolet and GMC from 1967 to 1974. The 5.7LG has a bore of 4.17 inches (104 mm), stroke of 3.53 inches (90 mm) and compression ratio of 8:1.