Introducing our Brand New High Compression Dome Piston and Rods Kit for the LS3!

https://youtu.be/tXBVzeCQxwo As GPI customers and GPI builds have become a force to reckon with in the naturally aspirated racing scene, we could not help but notice the lack of shelf piston options geared towards this environment. Staying true to our name, we contacted our friends at Diamond Pistons to set about designing a new piston. […]

The Ultimate LS3 Intake Manifold Dyno Shootout!

We get a lot of questions about intake manifolds, and because our recommendations vary depending on use and application – we thought it would be helpful to conduct a series of tests which demonstrate the several available intake manifolds back to back on the same engine. We hope these results will help our customers better […]

Huge L83 & L86 NA Head & Cam Performance Gains (+100rwhp!)

LT’s are the new LS’s! The performance truck market continues to grow at a staggering rate – with huge popularity going back to the early LS trucks. The L83 (5.3L) and L86 (6.2L) performance potential is especially promising due to these modern generation LT engines offering so much more power and technology than its predecessor […]

Solving the LT1 / LT4 Fueling Issues!

It’s a well known fact the direct injected LT1 / LT4 engines have fuel starvation issues at high boost levels – which leads to blown rings and melted pistons. We are developing a port fuel injection system system (similar to the new ZR1) utilizing the 42 Autosports Port Injection Control Kit and Haltech EMS to supplement the factory fuel […]

Bulletproofing the LT1 for Big Boost with GPI’s LT1 Drop in Piston / Rod Package!

Bulletproofing the LT for Boost The LT series GM engines are incredible powerplants as designed – however unlike their predecessor (LSx) – the LT’s commonly rebel when power adders such as superchargers, turbos, and nitrous are added. unlike the LS – the LT’s commonly rebel when power adders such as superchargers, turbos, and nitrous are […]

Lifters, Lash and Preload. What you don’t know won’t hurt you, or will it?

In speaking with our customers, and browsing various automotive forums – I have observed a lot of confusion and misinformation concerning hydraulic lifter operation and preload specification. I have concluded it may be helpful to provide some information on this subject. Anatomy of a Hydraulic Lifter A hydraulic lifter isn’t too complicated. It consists primarily […]

Chapter 2: Engine Dyno of the MAX Performance Package

THE ENGINE DYNO RESULTS ARE IN! 150HP MORE THAN STOCK LS3! Here is our latest testing of the LS3 / L99 MAX Performance Head & Cam Package. We’ve taken the goodness of the LS7, and adapted it to the LS3 / L99 platforms, to create a package that is the best of both worlds! The […]

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