General Motors LS-based small-block engine: Difference between revisions

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Revision as of 17:42, 16 February 2025

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[[File:2006 Chevrolet Corvette Z06 LS7 engine.jpg|right|thumb|250px|7.0L LS7 engine in a 2006 [[Chevrolet Corvette]] Z06]]

The '''LS7''' is a {{cvt|7011|cc|L cuin|1}} engine, based on the Gen IV architecture. The block is changed, with [[Cylinder (engine)#Cylinder sleeving|sleeved]] cylinders in an aluminum block with a larger bore of {{cvt|4.125|in|mm|1}} and longer stroke of {{cvt|4|in|mm|1}} than the LS2. The small-block's {{cvt|4.4|in|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 piston|hypereutectic]]. The two-valve arrangement is retained, though the titanium intake valves by Del West have grown to {{cvt|2.2|in|mm}} and sodium-filled exhaust valves are up to {{cvt|1.61|in|mm}}.

Peak output is {{cvt|505|bhp|PS kW|0}} at 6300&nbsp;rpm (72.0 BHP/L) and {{cvt|470|lbft|Nm|0}} of [[Torque#Machine torque|torque]] at 4800&nbsp;rpm with a 7000&nbsp;rpm redline.<ref>{{Cite web|url=https://www.carfolio.com/specifications/models/car/?car=124300|website=carfolio.com|title=2005 Chevrolet Corvette Z06, 2006 MY C6 US specifications|access-date=June 23, 2018|archive-date=June 24, 2018|archive-url=https://web.archive.org/web/20180624121259/https://www.carfolio.com/specifications/models/car/?car=124300|url-status=live}}</ref> During GM's reliability testing of this engine in its prototype phase, the LS7 was remarked to have been repeatedly tested to be 8000&nbsp;rpm capable, although power was not recorded at that rpm level, because of the constraints of the camshaft's hydraulic lifters and the intake manifold ability to flow required air at that engine speed.