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

Revision as of 02:20, 9 January 2005

Revision as of 15:10, 2 March 2005

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==LS7==

The '''LS7''' is the latest high-power LS engine. It is a 7.0 L (7008 cc) unit, based loosely on the LS2. The block is changed, with a larger 4.13 in (104.9 mm) bore and longer 4.00 in (101.6 mm) stroke than the LS2. The small-block's 4.4 in (111.8 mm) bore spacing is retained, requiring pressed-in cylinder liners. The [[crankshaft]], and main bearing caps, and pistons are [[forged]] steel for durability, and the connecting rods are titanium, however cast pistons were retained to avoid the piston slap issues that forged pistons have on startup. The two-valve arrangement is retained, though the titanium intake valves have grown to 2.20 in (55.9 mm) and sodium-filled exhaust valves are up to 1.61 in (40.9 mm).

Peak output is 500 hp (373 kW) at 6200 RPM and 475 ft.lbf (644 Nm) at 4800 RPM with a 7000 RPM [[redline]].