Maximizing Power from a Junkyard LS V8: A Guide by Richard Holdener
Turbochargers and superchargers have simplified the pursuit of additional power, enabling even small four-cylinder engines to achieve performance levels once exclusive to larger engines. While forced induction remains a preferred choice for many enthusiasts, some still favor naturally aspirated setups. This path can be more challenging, especially when avoiding nitrous oxide systems. Fortunately, Richard Holdener, a renowned dyno expert and YouTube creator, demonstrates how to unlock significant power using an affordable Chevy LS V8 sourced from a junkyard along with some enhanced components.
To begin, it is crucial to locate a 5.3-liter LS engine equipped with flat-top pistons. Only specific versions, such as the L33, feature these pistons, which are vital for maximizing power output in this configuration. While retrofitting flat-top pistons can be costly and labor-intensive, finding a junkyard engine that already includes them is economically advantageous. With such an engine, you can achieve an additional 200 horsepower by simply modifying the top end.
Holdener tested a stock 5.3-liter LS with flat-top pistons on a dynamometer to establish a baseline power output. The results were as expected: it produced 342 horsepower at peak and 379 lb-ft of torque. These figures may vary slightly depending on the engine’s overall condition, but they serve as a solid reference point.
Next, Holdener moved on to the first round of modifications.
The primary focus of enhancing power from a naturally aspirated LS is upgrading the camshaft. For this initial test, Holdener employed a cam with a lift of .552 and a duration of 212/22x degrees with a lobe separation angle of 107 degrees. He noted that numerous aftermarket cams are available, which could potentially increase power by 65 to 70 hp. Remarkably, this particular camshaft modification boosted the engine’s output by 80 hp, elevating the total power from 342 hp to 422 hp. Further upgrades included ported heads and a new intake manifold, which pushed performance even higher to 484 hp — a 142 hp increase from the stock configuration, achieved simply through standard aftermarket parts.
The adventure did not stop there. Holdener continued to explore additional power options without resorting to forced induction or nitrous. He installed custom ported and milled heads along with an advanced intake manifold, which allowed the junkyard engine to produce 510 hp. He then replaced the existing cam with a more robust Brian Tooley Racing Stage 4 LS3 cam and a BTR Trinity intake manifold featuring a 102-millimeter throttle body. This final upgrade resulted in a remarkable 542 hp, hitting the sought-after 200 hp increase.
While these modifications can be costly, sourcing an LS engine for a low price from a junkyard can greatly reduce expenses. If you aim to maintain the distinctive sound, throttle response, and power delivery characteristic of an LS V8 while upgrading your vehicle, this approach is a viable option.
For further insights, you can check Holdener’s complete process in his YouTube video.
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