Just as the original Ed Cole-design Chevrolet small-block V-8 launched an era of American performance upon its introduction in the mid-1950, so did the LS-series third-generation small-block Chevrolet V-8 when it launched a quarter-century ago. And just as the original SBC spawned dozens of variants over its decades-long lifespan, so did the LS – enough to bewilder all but the most dedicated of engine-spotters without a comprehensive reference guide to the engine family’s various displacements, codes, and ratings. So let’s dive into it.
WHAT SETS THE LS V-8 APART
Every history of the LS calls it a clean-sheet design – that is, a design that carries nothing over from its predecessor, the Generation II LT-1. Indeed, engineers Tom Stephens and Ed Koerner retained only two parts from the LT-1 when designing the LS series: the rod bearings and the lifters. It’s a thoroughly modernized small-block, with deep side skirts, cross-bolted six-bolt main bearing caps, no provision for a distributor, no coolant passages in the composite intake manifold, cathedral-port heads, and perhaps most important, all-aluminum construction.
Yet, it’s no cutting-edge engine. Even at its introduction, critics derided its overhead-valve design – complete with the single camshaft located in the block, just two valves per cylinder, and pushrods and rocker arms in between – as antiquated. Overhead-camshaft and dual-overhead-camshaft designs had long become the standard for performance engines, after all.
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