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Tag Archives: 5.3L

Speed Secrets: Adding ZEX Nitrous To A Turbo 5.3! HUGE Gains!

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Working with the experts at ZEX, two of the funnest parts of building an engine are tested: boost and nitrous! Nitrous is awesome, boost is awesome, but what happens when you combine the two? Double the fun! When it comes to choosing nitrous or boost, the majority of engine builders will opt for one or the other, but why choose ... Read More »

Speed Secrets: LSXR vs. Stock Truck Intake Dyno Test! Which Makes More Power?

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Working with the experts at FAST, it’s time to test the factory 5.3-liter intake manifold against the LSXR intake manifold. If this goes like any of the prior testing, the FAST manifold is going to be a tough one to beat. This is even truer with heavily modified engines, but how well will it work on a milder 5.3-liter engine? ... Read More »

Speed Secrets: Boosted 5.3 Upgrades = BIG POWER!

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The 5.3-liter GM Gen III engine came from humble beginnings as an easy to find engine at any given junkyard (due to its widespread use in GM trucks) as an alternative to an LS1, and now it’s becoming an engine prefer instead of the LSs, especially when it comes to boost. These engines seem to love to be force fed! ... Read More »

Speed Secrets: Cam and Nitrous on a Junkyard 4.8! 

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GM’s LS engine has quickly gained a reputation as the ultimate power house and it seems as if everyone is transplanting these engines into everything. While you can buy a well built Crate engine, because of the LS engines potential it can be quite expensive. Lucky for us, GM saw that same potential in the LS engine family and used ... Read More »

Modern Muscle: Zex-Injected DI L83

Nothing wakes up a new direct-injected, LT-based motor like a little Zex!

 Like anything new, the arrival of the junkyard L83 5.3L at Westech was met with a certain amount of skepticism. Having run endless testing on the previous generation LS engine family with tremendous success, we really didn’t know what to think about the new direct-injected LT motor. The LS was such a huge jump in performance over the previous Gen-2 ... Read More »

Building Better Boost: Turbo LS Cam Swap

Why do you need to upgrade your cam when you have boost?

When it comes to improving power on almost any motor, few things can rival boost. This is especially true of the LS platform, as they seem to take to boost like a proverbial fish to water. The great thing about boost is how easy it is to get extra power. Whether it comes from a supercharger, or (like in our ... Read More »

The 100 Horsepower Upgrade: Cam Only 5.3L Test

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Words and Photos: Richard Holdener  Despite being introduced way back in the 1990’s (1999 to be exact), and being replaced by the new Gen V LT engine family, the LS engine still reigns supreme. One need only look at the popularity of the LS for all manner of performance, including its use for engine swaps. If market sales are any ... Read More »