Base Price $11,200

The LSx 427 short block uses a new GM LSx cast iron block with 4.125" bore and 4.000” Stroke to produce the large 427ci.



  • Dart SHP Pro Cast Iron Block Honed with Torque Plates
  • Bore Size 4.125″
  • Zero Decked
  • 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 Magnum 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 Ultra 4340 Forged Steel H-Beam
  • 6.125” Length
  • ARP 2000 Rod Bolts


  • Wiseco Gas Nitrided Ring Set


Technical Links: (Coming Soon)


  • Installing Windage Tray, Oil Pump Pick Up and Covers
  • Installing LS Harmonic Balancer
  • Torque Specs for Entire Engine
  • How to Set Pushrod Preload on LS Engine
  • How to Properly Prime the LS Oil Pump
  • Recommendations; Oil, filter, spark plugs


Attention all high-power enthusiasts! The Golen Engine 427ci LSx Competition Boosted Short Block is here to shatter expectations. Built to handle a staggering 1500hp, this engine is a true behemoth in the realm of power and performance. At its core is the robust Dart SHP Pro Cast Iron block, reinforced with ARP main studs for unparalleled strength.

Under the hood, you’ll find a Callies Magnum crankshaft and Callies Ultra Connecting Rods, a combination that promises durability and resilience under extreme conditions. The engine’s heart beats with Wiseco 2618 forged pistons, fully decked out with skirt and dome coatings to withstand massive boost levels.

But the power doesn’t stop there. We offer a complete line of big boost parts to complete your build, ensuring every component can handle the intense power you’re gunning for. And don’t worry about assembly – our full tech support is on hand to guide you through every step, ensuring your engine is put together perfectly.

With the Golen Engine 427ci LSx Competition Boosted Short Block, you’re not just building an engine; you’re creating a powerhouse capable of delivering up to 1500hp. It’s time to unleash the beast!

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!!