408 LS Short Block Engine


Base Price LY6 $5,899

The LY6 408ci Boosted Competition short block uses a new GM LY6 cast iron block with 4.030" bore to produce the large 408ci.



  • 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


  • Wiseco Custom Forged Boost Pistons


  • 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)


Calling all turbo and supercharger fans! The Golen Engine 408ci LY6 Boosted Competition Short Block is here, and it’s a force to be reckoned with. We start with a tough GM LY6 cast iron block, beefed up with ARP main studs and Durabond cam bearings. At its heart lies a Callies Comp Star 4340 forged steel crankshaft with 8 counterweights, plus Callies Comp Star H-Beam rods with ARP 2000 rod bolts.

We’re using Wiseco 2618 forged pistons with GFX ring sets – perfect for handling big boost. This engine is fully assembled, balanced, blueprinted, and kitted out with King bearings. It’s built to take up to 20 psi of boost from either superchargers or turbos, making it a beast in the boost world.

Need more parts to finish your build? We’ve got you covered with Cometic MLS head gaskets, ARP Head studs, and our own Golen Engine Aftermarket LS3 CNC Ported heads. These heads are the real deal, with .750″ thick decks to keep all that boost where it belongs.

And don’t sweat the assembly – we offer full tech support, along with a bunch of tech links and videos for off-hour help. The Golen Engine 408ci LY6 Boosted Competition Short Block is your ticket to dominating the boosted scene. Let’s get building!

When you choose a 408 LS short block engine from Golen Engine, you’ll be getting the power and performance you need to rule the road. These 408 stroker Chevy engines are ready to go, featuring professional assembly, so you should be able to drop it in as soon as it gets to you.

You should have no trouble getting the most out of a 408 short block engine because it is ready for a high-performance boost immediately. These LSx 408 short block engines also work with centrifugal-style superchargers, twin-screw-style superchargers or turbochargers, so they’re versatile enough to fit into your current setup.

We build each LS 408 stroker short block engine to the same exacting standards as the rest of our racing engines. This means you can expect to receive the same level of performance and reliability from this machine throughout its lifetime. We stand behind our work with a standard three-year warranty with no mileage limit. With an engine from Golen Engine, you can feel confident every time you crank it over because you’ll know we will be there to help if anything goes wrong.

We are able to build your 408 LS short block 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 of your new 408 stroker short block engine. It is mandatory for you to contact Golen Engine Tech Support before starting your 408 stroker Chevy 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!!