![]() The valvetrain is equipped with hydraulic lash adjusters. The diameter of intake valves 1.89 inches (48 mm) and the exhaust valves are 1.46 inches (37 mm). This configuration allowed to make the shape of the combustion chamber and the arrangement of spark plugs more efficient (almost hemispherical chambers). Intake and exhaust valves are pushed apart, and rocker arms are turned by 180 degrees relative to each other. Each cylinder head has only two valves per cylinder and one top-mounted, chain-driven hollow camshaft (SOHC design). Between each head and engine block, there is a three-layer laminated stainless steel gasket. The engine is equipped with cast aluminum alloy cylinder heads. While the 3.7L V6 has a balancing shaft, the 4.7L engine doesn't need it. From underneath, the crankcase is sealed by a stamped steel oil pan. This engine has powder-forged metal, fracture-split connecting rods (the length is 6.12 inches/155.5 mm) and cast aluminum pistons with moly coated skirts. The bedplate made of compacted graphite iron adds rigidity to the block and reduces noise and vibration. The debuted engine was fitted with a nodular cast-iron crankshaft, which is attached to the block by using a single bedplate instead of five individual main-bearing caps. The engine block was designed from scratch and all dimensions are new. The 4.7L PowerTech has a cast-iron cylinder block with a 4.09 inch (104 mm) bore spacing, a 9.09 inch (231 mm) deck height, and a 90-degree angle between cylinder banks which is optimal for using one crankpin journal for a pair of connecting rods.
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