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The 4.8L and the 5.3L are smaller truck versions of the LS1 and were designed to replace the 305 and the 350 in trucks. The 4.8L and 5.3L engines share the same Gen III LS-series engine block and heads (upper end) and therefore, most parts interchange freely between these engines and other variants in the LS family.
The Group 1 engines were the smallest in displacement and outer dimensions, and differed most significantly from the larger Group 2 and Group 3 engines by having only four main bearings (whereas the Group 2 and 3 engines had seven) [1]: 15 and a different firing order (1-5-3-6-2-4, whereas the others are 1-4-2-6-3-5).
In an internal combustion engine, a head gasket provides the seal between the engine block and cylinder head(s). Its purpose is to seal the combustion gases within the cylinders and to avoid coolant or engine oil leaking into the cylinders. [1] Leaks in the head gasket can cause poor engine running and/or overheating.
Engine: Power Stroke 90° V8 Displacement: 6.7 L (406 cu in) Bore and stroke: 3.9 in × 4 + 1 ⁄ 4 in (99.1 mm × 108.0 mm) Block: Compacted graphite iron Heads: Aluminum (reverse flow) Pistons: Hypereutectic piston: Valvetrain: OHV, 4 valves per cylinder (32 valves in total) Horsepower: 450 hp (336 kW) at 2,800 rpm Torque:
In 1926, the Pontiac Six was introduced as a lower-cost version of the Oakland six, powered by the Pontiac Split-Head Six flathead engine, which used two cylinder heads. This engine was replaced by the 1941–1954 Pontiac flathead six. The unrelated Pontiac OHV 6 overhead valve engine was produced in 1964–1965, based on a Chevrolet design.
The 304.6-cubic-inch (5.0 L) 305 had a 4.25 in × 3.58 in (108 mm × 91 mm) bore and stroke. [11] The 305A was equipped with a single barrel carburetor and produced 150 hp (112 kW) gross at 3600 RPM and 260 lb⋅ft (353 N⋅m) gross at 1600 RPM (measured without air cleaner or accessories in an ideal environment).
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