Base Price $8,499

The LS7 427ci competition short block uses a new GM LS7 block with 4.125" bore to produce the 427CI. This is a great replacement engine for your Z06 Corvette but can be built to work in just about any car.

This engine is a great foundation for street or mild race applications



  • New Dart SHP Pro Cast Iron LS Block Honed with Torque Plates (Dart aluminum or Concept Performance LSr Aluminum blocks available as upgrade)
  • Bore Size 4.125″
  • 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)


Gearheads, listen up! We’re talking about the Golen Engine 427ci LS Competition Short Block, a true powerhouse for those who live and breathe engines. This beast comes with a Dart SHP Pro Cast Iron block, known for its toughness and durability. Inside, it’s all muscle with a Callies Comp Star forged crank and H-beam connecting rods, built to handle anything you throw at it.

But wait, there’s more. This engine is decked out with ARP Main studs and King Performance bearings, ensuring smooth running and reliability. The crowning jewel? A set of Mahle Motorsports 4032 forged pistons with plasma moly rings, giving you the durability and performance you need.

Need to finish your build? We’ve got you covered with every part you could need, like our Golen Engine Aftermarket LS3 CNC ported heads, perfect for maximizing airflow and power. And don’t worry about putting it all together – our full tech support is here to help you choose the right components to hit your horsepower goals and guide you through assembling your engine.

With the Golen Engine 427ci LS Competition Short Block, you’re not just building an engine; you’re creating a beast ready to conquer the streets or the strip. So, let’s get wrenching and make that dream engine a reality!

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!!