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LS3 Engine Specs
LS3 is also known as the 402 CID Chevrolet Big-Block engine of the 1970s. The LS3 was introduced as the Corvette's new base engine for 2008 models. It produces 430bhp (321Kw)@5900rpm and 424lb-ft (575Nm)@4600rpm without the optional Corvette exhaust and is SAE certified. The block is an updated version of the LS2 casting featuring a larger bore of 4.06 in (103 mm) creating a displacement of 6,162 cc (6.162 L; 376.0 cu in). It also features higher flowing cylinder heads sourced from the L92, a more aggressive camshaft with 0.551" lift, a 10.7:1 compression ratio, a revised valvetrain with 6 mm (0.24 in) offset intake rocker arms, a high-flow intake manifold and 47 lb/hr fuel injectors from the LS7 engine. The LS3 engine in the E Series II GTS (September 2009) was upgraded to produce 436 bhp (325 kW).
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At a Glance: 2010 LS3
Engine Type 6.2L V-8
Aluminum block and heads
Displacement - 376 / 6162
Bore - 4.06 x 3.62 / 103.25 x 92
Fuel delivery - turnless, multiport fuel injection
Horsepower - 426 / 315 @ 5900rpm / 6600 max prm
Torque (lb. ft.) - 420 / 553 @ 4600rpm |
The L76/L92/LS3 cylinder heads use 2.165 in (55.0 mm) intake valves, and 1.59 in (40 mm) exhaust valves. Improved manufacturing efficiency makes these heads cheaper than the outgoing LS6 heads, and severely undercuts aftermarket heads. But large valves, however, limit maximum rpm - 6000 in the L76 (with AFM), and 6600 in the LS3 (with hollow stem valves).
Dual mode exhaust package with a bypass on acceleration is available, which uses vacuum-actuated outlet valves to help control engine noise during low-load operation, but open for maximum performance during high-load operation. The system is similar to the C6 Z06, but uses a 2.5 in (64 mm) diameter exhaust compared to the Z06's 3 in (76 mm). Power is boosted to 436 hp (325 kW) and 428 lbfft (580 Nm) with this option.
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