The LS3 was introduced as the
Corvette's new base engine for the 2008 model year. It
produces 424 bhp (316 kW)@5900rpm and 418 lb·ft (567 N·m)@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 (103.1 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
a more aggressive camshaft with 0.551" lift, 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.
L76/L92/LS3 cylinder heads use 2.165 in (55 mm) intake
valves, and 1.59 in (40.4 mm) exhaust valves. Improved
manufacturing efficiency makes these heads cheaper than the
outgoing LS6 heads, and severely undercuts aftermarket
heads. The large valves, however, limit maximum rpm -
6600 in the LS3 (with hollow stem valves).