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Thread: LS7 History

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    LS7 History


    7.0 L LS7 engine in a 2006 Chevrolet Corvette Z06

    LS7 can also refer to a 454 over the counter 460+ hp high compression engine Chevrolet Big-Block engine of the 1970sThe LS7 is a 7,008 cc (7.008 L; 427.7 cu in) engine, based on the Gen IV architecture. The block is changed, with sleeved cylinders and a larger 4.125in (104.775mm) bore and longer 4.00in (101.6mm) stroke than the LS2. The small-block's 4.4 in (110 mm) bore spacing is retained, requiring pressed-in cylinder liners. The crankshaft and main bearing caps are forged steel for durability, the connecting rods are forged titanium, and the pistons are hypereutectic. The two-valve arrangement is retained, though the titanium intake valves by Del West have grown to 2.20 in (56 mm) and sodium-filled exhaust valves are up to 1.61 in (41 mm).
    Peak output is 505 hp (377 kW) at 6300 rpm and 470 lb·ft (640 N·m) at 4800 rpm with a 7100 rpm redline[citation needed] During GM's reliability testing of this engine in its prototype phase, the LS7 was remarked to have been repeatedly tested to be 8000 rpm capable, although power was not recorded at that rpm level, due to the constraints of the camshaft's hydraulic lifters and the intake manifold ability to flow required air at that engine speed.
    The LS7 is hand-built by the General Motors Performance Build Center in Wixom, Michigan. Most of these engines are installed in the Z06, some are also sold to individuals by GM as a crate engine.
    After an extensive engineering process over several years, Holden Special Vehicles fitted the LS7 to a special edition model, the W427. The HSV-tuned engine produced 375 kW (503 hp) and 640 N·m (470 lb·ft). The W427 was unveiled at the Melbourne International Motor Show on 29 February 2008[12] and went on sale in August 2008. The first Australian car to be fitted with this engine, however, was the CSV GTS of 2007, which was claimed to have a power output of 400 kW (536 hp) and 600 N·m (440 lb·ft).[13]

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  2. #2
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    The orignial Big Block LS7 was the foundation of many legends and myths. First it was a crate motor never factory installed. Sorry no factory built LS7 Chevelles. Though many dealers did install them in cars like the Chevelle, Vette, and Camaro. You might have heard of Yenko, Baldwin, and others who built go fast cars. The original "dealer installed" performmance cars.
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