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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.
Starting in 1979, a two-barrel intake fitted with a Rochester Varajet carburetor and dual take down exhaust manifold were used in trucks and vans. The "integrated" cylinder head and intake manifold claimed to have resulted in increased low end torque and fuel economy inclusive of a smoother operation, lowering NVH (noise, vibration, and harshness).
The GM L3B engine is a turbocharged four-cylinder gasoline engine designed by General Motors. It is an undersquare aluminum DOHC inline-four displacing 2.7 liters (165 cid) and tuned for strong low-end torque.
A redesigned cylinder head and manifold for improved air flow. Variable exhaust valve timing (the LW2 engine only had variable intake valve timing) Specially-developed fuel injectors. New pistons with pentroof-style centre-domes and valve eyelets for a higher compression ratio of 12.2:1 (compared to 10.2:1 for the dual fuel engine).
The Chevrolet 90° V6 family of V6 engines began in 1978 with the Chevrolet 200 cu in (3.3 L) as the base engine for the all new 1978 Chevrolet Malibu. The original engine family was phased out in early 2014, with its final use as the 4.3 L (262 cu in) V6 engine used in Chevrolet and GMC trucks and vans.
The 230 cu in six and 153 cu in four are thus essentially the same design, differing only in cylinder count. In the Chevy II the engine was branded as the Super-Thrift 153, [1] [2] while in the 1964 Chevy Van, it was called the High Torque 153. [3] Peak power and torque were 90 hp (67 kW) at 4,000 rpm and 152 lb⋅ft (206 N⋅m) at 2,400 rpm ...