LS3 engine specifications - Camaro5 Chevy Camaro Forum Camaro ZL1, SS . . . LS3 is used in manual version SS models L99 used in automatic version SS models LS3 produces 426hp 408lb-ft tq compared to L99's 400hp 395lb-ft tq L99 camshaft is different -- having a little less duration and a little less lift, both of which give the engine a smoother idle L99 has a cam phaser and, to get the additional piston-to-valve clearance required when cam phasing changes, the
CAMARO WIKI - Camaro5 Chevy Camaro Forum Camaro ZL1, SS and V6 Forums . . . The 2010 5th Generation SS trim level coupe with manual transmission is powered by the LS3 6 2 L (≈376 cu in) V8 engine producing 426 hp (318 kW) @ 5900 RPMs and 420 lb-ft (569 N m) @ 4600 RPMs while the SS with automatic transmission is power by a new L99 6 2 L V8 engine with Active Fuel Management producing 400 hp (300 kW) @ 5900 RPMs and