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The two-valve arrangement is retained, though the titanium intake valves by Del West have grown to 2.2 in (56 mm) and sodium-filled exhaust valves are up to 1.61 in (41 mm). Peak output is 505 bhp (512 PS; 377 kW) at 6300 rpm (72.0 BHP/L) and 470 lb⋅ft (637 N⋅m) of torque at 4800 rpm with a 7000 rpm redline. [68]
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).
Like the Tahoe, the Yukon will also feature an independent rear suspension, a 3.0-liter inline-six turbodiesel engine, and a top-shelf suspension option featuring air springs and magnetic-ride shocks, a standard 5.3-liter V-8, an optional 420 hp (310 kW) 6.2-liter V-8, and a 10-speed automatic transmission that is standard across the lineup.
In 1968, the engine had the chrome covers, but without the Chevrolet name, connected to a PCV valve and a chrome 14 in × 3 in (355.6 mm × 76.2 mm) drop-base open-element air cleaner assembly fitted with a crankcase breather on a 780 cu ft/min (22 m 3 /min) vacuum secondary Holley 4-Bbl carburetor. 1969 Corvette and 1970 Z/28 engines were also ...
It is notable that the second generation system uses engine oil to hydraulically modulate engine valve function. As a result, the system is dependent upon the quality of the oil in the engine. As anti-foaming agents in engine oil are depleted, air may become entrained or dissolve in the oil, delaying the timing of hydraulic control signals.
The GMT900 is a General Motors full-size pickup and SUV platform used from the 2007 to 2014 model years.The platform was introduced at the 2006 North American International Auto Show, as the replacement for the GMT800 platform.
Starting with the 2002 model year, power was increased to 405 hp (411 PS; 302 kW) at 6,000 rpm and 400 lb⋅ft (542 N⋅m) of torque at 4,800 rpm, due to a larger air intake, stiffer valve springs, lighter sodium filled valves, more aggressive camshaft lift and timing, and a less restricted exhaust that eschewed the use of pre-catalytic converters.
The ZR2 is the "off-road" trim level, and adds to the Z71 trim level: 2-inch taller suspension, 3.5-inch wider track, 31-inch off-road tires, unique aluminum-alloy wheels, leather-trimmed seating surfaces, functional rock sliders, Multimatic DSSV position-sensitive shock absorbers, aluminum skid plates to protect the radiator, oil pan, and ...