Port-fuel injection places the injectors on a fuel rail mounted the intake manifold.
Cylinder Head Design: the LS1 cylinder heads feature all-aluminum construction, Cathedral intake port shapes, oval exhaust port.Camshaft Design: the LS1 engine uses a hydraulic roller-lifter camshaft, and received two slightly varied cam specifications depending on the application and model year.Possible oil consumption issues noted on early LS1 engines. PCV System: the LS1’s PCV system pullz crankcase gases and engine oil blow-by from the valve cover, the system.
The connecting rods have an I-beam design. Rotating assembly: within the Gen III block is a durable rotating assembly that includes a cat iron crankshaft and 6.098-inch-long, powder-metal connecting rods, as well as M142 hypereutectic cast aluminum-alloy pistons.The oil pump is on the front of the block, and the oil filter is near the rear of the engine.Īll Gen III engines are designed to be used with GM’s AC Delco motor oil. Oiling System: the oiling system utilizes a conventional “wet sump” design with the oil pickup being rear-mounted in the oil pan.The bore and stroke dimensions are: 3.90-inch (99 mm) bore x 3.62-inch (92 mm) stroke. Cylinder block: the Gen III cylinder block shares key design elements with GM’s original small-block V8: a 90-degree cylinder angle and 4.400-inch bore centers.The HSV YII series was rated at 382 horsepower (285 kW), while version modified by Callaway named “C4B” produced 402 horsepower (300 kW) in the HSV GTS models. The engine was also available in the Pontiac GTO and in the Holden Commodore, Ute, and Caprice. Holden, GM’s Australian subsidiary, continued to make improvements to the LS1 throughout its lifetime. The engine was used in F-Body vehicles until 2002. The engine was rated at 305-310 horsepower, a rating believed by some to have been conservative. In 1998, GM introduced the LS1 in its F-Body vehicles - the Chevrolet Camaro and Pontiac Firebird Trans Am. The engine was used in the Corvette from 1997 through 2004. In 2001, GM improved the intake and exhaust manifolds, increasing the rating to 350 horsepower (260 kW) and 365 pound-feet of torque (495 Nm). The LS1 was initially introduced in the 1997 Chevrolet Corvette C5, in which it was rated at 345 horsepower (257 kW) at 5,600 rpm and 350 pound-feet of torque (470 Nm) at 4,400 rpm. Other than a similar displacement, external dimensions and rod bearings, the LS1 shared little with the Gen II LT1 engine it replaced. The 5.7L LS1 introduced the third generation of General Motors’ Small Block V8 engines.
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