Chevrolet GM 6.0L Vortec V8 (LQ4/L96)

Chevrolet GM 6.0L Vortec V8 (LQ4/L96) — every model and year that used this engine (57 models, 1981–2022), based on NHTSA VIN build data, with links to prices and reliability.

HD trucks and vans small-block.

6.0L · 8 cylinders · seen in 57 models, 1981–2022

By the numbers

Output range 293–364 hp (median 364 hp). Gasoline: 99%. Based on 2,189 decoded NHTSA VIN build sheets.

About this engine family

The General Motors LS-based small-block engines are a family of V8 and offshoot V6 engines designed and manufactured by the American automotive company General Motors. Introduced in 1997, the family is a continuation of the earlier first- and second-generation Chevrolet small-block engine, of which over 100 million have been produced and is also considered one of the most popular V8 engines ever. The LS family spans the third, fourth, and fifth generations of the small-block engines, with a sixth generation expected to enter production soon.

Various small-block V8s were and still are available as crate engines.

In detail

The brainchild of Chevrolet chief engineer Ed Cole, the first generation of the Chevrolet small-block engine was first unveiled in the 1955 Chevrolet Corvette and Chevrolet Bel Air, both powered by the "Turbo-Fire." The 265 Turbo-Fire distinguished itself from other engines of the era such as Cadillac's 331 series of the late 1940s and early 1950s by reducing the size and weight of various components within the engine; a compact engine block combined with a light valvetrain gave the Turbo-Fire a weight reduction compared to the inline-sixes (despite having two more cylinders) that initially powered the first generation of the Corvette, alongside a significant horsepower increase of 25%.

This contributed to lowering the Corvette's from 11 seconds to 8.7. Nicknamed the "Mighty Mouse," the Turbo-Fire soon became popular within the hot rodding community too, along with scoring wins in stock car racing. A larger version of the Turbo-Fire arrived in 1957, now bored out. This gave the new engine a total displacement of ; this newer version was dubbed the "Super Turbo-Fire." The Super Turbo-Fire was also the first engine offered with mechanical fuel injection.

The top-of-the-line model produced , giving it a 1:1 cubic inch to horsepower ratio; this lowered the Corvette's to 7.2 seconds. General Motors would produce more powerful and larger displacement iterations of the small-block, until stringent emission regulations in the late 1960s severely limited performance. The Malaise era (roughly 1973 to 1983), as it was known, saw some of the lowest horsepower figures in several muscle and or pony car engines.

This included the Corvette whose power output dropped below despite a displacement of . 1992 saw the second generation of Chevrolet small-block hit the market in that year's Chevrolet Corvette in the form of the LT1 small-block. It featured a new ignition system, reverse-flow cooling (cooling the cylinder heads first), and new engine block, but the valvetrain and engine mounts were carried over in order to maintain a degree of compatibility with the previous generation.

Other modifications such as a better flowing intake manifold and cylinder heads gave the LT1 a power output of . The second generation culminated in the LT4 small-block, which gained a minor power increase of . Other changes included a lighter valvetrain and strengthened crankshaft. The decision to stick with pushrod technology was seen as archaic at the time; such engines were seen as outdated compared to the smaller capacity (but more powerful and fuel efficient) overhead cam engines favored by European and Asian manufacturers.

One of GM's domestic rivals, Ford, had announced plans to axe its small block engine from production in the early 1990s, in favor of its Modular engines. Another domestic rival, Chrysler Corporation, had stopped building passenger cars with V8 engines years prior, relegating them to its trucks and SUVs. Many car enthusiasts also desired a dual overhead cam engine; GM in response had developed the Northstar engines for Cadillac, but those engines were initially exclusive to that brand and not originally designed for rear-wheel-drive vehicles.

Later on, Sam Winegarden, former General Motors chief engineer for small-blocks, stated that despite the stigma of the pushrod engine being "a symbol of the uncompetitiveness [sic] of the domestic industry," the decision to stick with pushrods was made on the basis that switching to overhead camshafts was unnecessary. The power requirements for the Corvette were satisfied by simply increasing engine displacement. Current General Motors chief engineer for small-blocks Jake Lee also stated that switching to overhead camshafts would also increase the height of the engine by , rendering it too tall to fit under the hood of the Corvette.

Source: Wikipedia — General Motors small-block engine, CC BY-SA.

Models that used this engine

Model Years with this engine Fuel VIN builds seen
SILVERADO 1999–2018 Gasoline 1,237
EXPRESS 2003–2022 Gasoline 602
SUBURBAN 2000–2019 Gasoline 80
C7 1981–1998 Gasoline 38
SILVERADO HD 2019–2019 Gasoline 29
C6 1981–2020 Gasoline 21
W4 2003–2009 Gasoline 19

Engine usage derived from NHTSA VIN build data (displacement + cylinder configuration). Model links lead to prices, generations and reliability.

For sale with this engine