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

Revision as of 12:32, 1 July 2025

Revision as of 12:33, 1 July 2025

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=====LS4=====

:''LS4 can also refer to a {{cvt|454|CID|L|1}} [[Chevrolet Big-Block engine]] of the 1970s''

[[File:2006 Chevrolet Impala SS LS4 engine.jpg|right|thumb|250px|5.3 L LS4 V8 in a 2006 [[Chevrolet Impala]] SS]]

The '''LS4''' is a {{cvt|5327|cc|L cuin|1}} version of the Generation IV block. Though it has the same displacement as the [[#LY5|Vortec 5300 LY5]], it features an aluminum block instead of iron, and uses the same cylinder head casting as the Generation III LS6 engine. The LS4 is adapted for [[transverse engine|transverse]] [[front-wheel drive]] applications, with a bellhousing bolt pattern that differs from the rear-wheel-drive blocks (so as to mate with the 4T65E).

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=====LS3=====

: ''LS3 can also refer to a {{cvt|402|CID|L|1}} [[Chevrolet Big-Block engine]] of the 1970s.''

[[File:GM LS3 Engine.jpg|250px|thumb|right|GM LS3 engine in a 2008 [[Chevrolet Corvette]]]]

The '''LS3''' was introduced as the Corvette's new base engine for the 2008 model year. It produces {{cvt|430|bhp|kW PS|0}} at 5900 rpm and {{cvt|424|lbft|Nm|0}} at 4600 rpm without the optional Corvette exhaust and is SAE certified. The block is an updated version of the LS2 casting featuring a larger bore of {{cvt|103.25|mm|in|3}} creating a displacement of {{cvt|6162|cc|L cuin|1}}. It also features higher flowing cylinder heads sourced from the [[GM Vortec engine#6200|L92]], a more aggressive camshaft with {{cvt|14|mm|in|3|order=flip}} lift, a 10.7:1 compression ratio, a revised valvetrain with {{cvt|6|mm|in|3|order=flip}} offset intake rocker arms, a high-flow intake manifold, and {{cvt|47|lb}}/hour fuel injectors from the LS7 engine.