Chevrolet/GM 6.2 L LT4 supercharged V8 engine when paired with a 6-speed manual transmission

The GM LT4 6.2 L Supercharged V8 is one of General Motors’ most potent production small-block engines, engineered to deliver high horsepower and prodigious torque across a broad rev range. As a member of the Gen-V small-block family, the LT4 uses advanced technologies such as direct fuel injection, variable valve timing, and a high-efficiency 1.7 L Eaton R1740 TVS supercharger to significantly amplify airflow and boost pressure—typically over 9 psi—resulting in impressive performance for a factory engine.

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In stock form, the LT4 produces around 650 horsepower at approximately 6,400 rpm and about 650 lb-ft of torque at roughly 3,600 rpm, with a maximum recommended engine speed near 6,600 rpm.
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These figures represent SAE-certified outputs as found in performance cars like the Chevrolet Corvette Z06 and Camaro ZL1, making it one of the most powerful naturally aspirated and supercharged small-block V8s available from the factory.

The internal construction of the LT4 is robust and performance-oriented, featuring a lightweight cast aluminum block with six-bolt, cross-bolted main caps, a forged steel crankshaft, forged powdered-metal connecting rods, and forged aluminum pistons engineered to handle the high pressures of forced induction. The engine also uses Rotocast A356-T6 aluminum cylinder heads that improve strength and thermal efficiency compared to conventional castings, bolstered by titanium intake valves and sodium-filled exhaust valves for optimal flow and durability.

When mated to a 6-speed manual transmission such as the T56 Super Magnum or similar GM-approved 6-speed gearbox the LT4 provides a visceral, engaging driving experience that emphasizes driver control and mechanical connection. While most factory applications of the LT4 have traditionally used automatic transmissions, many enthusiasts and aftermarket builds pair this engine with a manual for a purist performance feel (e.g., in restomods or custom hot rods). The manual gearbox allows the driver to exploit the LT4’s broad torque curve and high-revving nature, keeping the engine in its optimal power band through careful gear selection. The strong mid-range torque of 650 lb-ft means excellent acceleration and throttle responsiveness from low speeds, while the 650 hp peak at high rpm ensures thrilling top-end performance.

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