The 3-valve cylinder head features apex-shaped combustion chambers with a centralized spark plug, two intake valves, and one large exhaust valve designed to improve velocity and volume. Valvetrain for all of them features low-friction roller rocker arms and hydraulic lash adjusters. Single camshafts, as well as individual intake and exhaust camshafts in the four-valve version, are driven by two timing chains (by one for each head). The 4.6 engine can be fitted with three types of aluminum cylinder heads: 2- valve (1990-2014) and 3-valve (2005-2010) with single overhead camshaft (SOHC) valvetrain and 4-valve with dual-overhead-camshaft configuration.
FORD IDS AND SCHEMATICS AND SPECS CRACKED
All engines came with forged pistons and cracked powdered metal connecting rods from the factory. Eight-bolt steel crankshaft was used in truck and high-performance applications, while six-bolt crankshafts usually were fitted in Romeo blocks under the hoods of passenger cars. Modular engines were equipped with six- or eight-bolt crankshafts.
Connecting rod length is 5.933 in (150.7 mm). The engine block features a nearly 1:1 bore-to-stroke ratio (square configuration) that positively affecting on its noise, harshness, and vibration characteristics. Deck height is 8.937 in (227.0 mm), and cylinder bore spacing measures 3.937 in (100.0 mm). The angle between cylinder banks is 90 degrees. Aluminum blocks came with 6-bolt main bearing caps. Aluminum cylinder blocks were cast at the Windsor Aluminum Plant (WAP) by the exception of older 90s Teksid blocks, which were cast in Turin, Italy. While Windsor iron blocks have "W" letter and dowel pins at the cross-bolted main caps, Romeo 4.6 iron blocks have jackscrew cross-bolted main caps and are identified by "R" (but not all of them). Ford's 4.6L V8 has a deep-skirt aluminum or cast iron cylinder block (Romeo and Windsor castings), depending on model year and application.