Base Price LY6 $5,899

The 408ci LY6 competition short block uses a new GM 408ci LY6 with 4.070" bore to produce the 408CI.

The larger cubic inch allows for more low end torque is a good
foundation for higher horsepower applications



  • GM LY6 Cast Iron Block Performance Honed with Torque Plate
  • Bore Size 4.030″
  • Resurfaced to match pistons
  • Line Honed with ARP Main Studs
  • Blueprinted Oil Clearances
  • All New GM Block Plugs Installed
  • New Durabond Cam Bearings Installed


  • Mahle Forged Pistons with Anti-Friction Coating


  • King H-Series Main and Rod Bearings


  • Callies Comp Star 4340 Forged Steel
  • Stroke 4.000”
  • Your Choice of 24x or 58x Reluctor Wheel (Billet 24X Reluctor Wheel is an Extra $150″)
  • Internally Balanced Front and Rear


  • Callies Comp Star 4340 Forged Steel H-Beam
  • 6.125” Length
  • ARP 2000 Rod Bolts

Technical Links: (Coming Soon)

Gear up, folks! Let’s dive into the world of the Golen Engine 408ci LY6 Competition Short Block – a real game changer for engine enthusiasts. At the core of this beast is the Callies Comp Star forged steel crank and H-Beam Connecting Rods, bringing unmatched strength and durability to the table.

This block isn’t just tough; it’s smart. CNC machined for precision, it’s decked out with ARP Main Studs and Durabond cam bearings, ensuring top-notch performance and reliability. We’re talking about a block that’s balanced and blueprinted to perfection, equipped with King Performance bearings and Mahle forged pistons. This means you’re getting an engine that’s fine-tuned for peak power and smooth running.

But we don’t stop there. Need to finish your build? We’ve got everything you might need. From a hydraulic roller camshaft that’ll help you hit your horsepower targets, to our top-tier Golen LS3 CNC ported aftermarket heads designed for maximum airflow and efficiency. These parts aren’t just components; they’re the keys to unleashing the full potential of your engine.

And here’s the kicker – we offer full tech support for the rest of your assembly. Whether you’re a seasoned pro or just starting out, our team’s here to guide you every step of the way. With Golen Engine’s 408ci LY6 Competition Short Block, you’re not just building an engine; you’re crafting a powerhouse tailored to your performance dreams. So, roll up your sleeves and let’s get to work – your ultimate engine build is waiting!

We are able to build your engine to match just about any specs you desire, so if you do not see it just ask us! When you purchase one of our LS HP or Hot Rod Series Street Engines you will receive a full spec sheet listing the exact components your engine was built with. We will also provide you with a complete Set Up Guide as well as full phone tech support to aid you with the installation process. It is mandatory for you to contact Golen Engine Tech Support before starting your engine for the first time and you can reach our Tech Support Line at 1-800-591-9171 ext 2.  Feel free to contact us anytime for help choosing the perfect performance engine combination!!