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The LS6 shares its basic block architecture with the GM LS1 engine, but other changes were made to the design such as windows cast into the block between cylinders, improved main web strength and bay to bay breathing, an intake manifold and MAF-sensor with higher flow capacity, a camshaft with higher lift and more duration, a higher compression ...
It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
A unique intake manifold that used the 48 mm (1.9 in) twin-bore throttle body from the 5.7L TPI Corvette engine was used on the engine's top end. [9] The turbocharged 4.3 L (262 cu in) was last used in the GMC Typhoon in the 1993 model year. The engine produced 280 hp (209 kW) at 4400 rpm and 360 lb⋅ft (488 N⋅m) of torque at 3600 rpm.
The W-series was a physically massive engine when compared to the "small-block" Chevrolet engine. It had a dry weight of approximately 665 pounds (302 kg), depending on the type of intake manifold and carburetion systems present. It was 1.5 inches longer, 2.6 inches wider, and 0.84 inches shorter than the 283 "small-block".
This was partially due to production ending earlier than usual to begin work on the 35th Anniversary models commemorating 35 years of the Camaro. The Z28 and SS models received the intake manifold from the LS6 engine, used on the Z06 from 2001 to 2004 and the first generation of the Cadillac CTS-V from 2004 to 2005. This change also resulted in ...
In F-body cars, at least, 1998-2000 had a larger cam than in the 2001-2002 models, which dropped EGR to use the LS6 intake manifold and had to have a smaller cam to clear emissions. In mid 2000, they also changed the head design (to the 241 heads from the 853 heads) which didn't change the design really.