One Block, Two Personalities

The foundation of both options is the same: a rock-solid 408 cubic-inch LS3, crafted with Smeding’s heavy-duty 6-bolt main block and forged internals. This isn’t just an LS with extra cubes—it’s a precision-built masterpiece ready to take abuse and deliver power mile after mile. From there, it’s your call:

• 500HP Hot Rod Version: Perfect for street cruisers who want big horsepower without sacrificing smooth drivability. It’s balanced, efficient, and tuned for builders who demand power without giving up daily-driver manners.
  
  
• 560HP Extreme Version: Crank it up to 11. This version brings a rowdier camshaft and aggressive tuning to pump out 560 horsepower. It’s the engine for hot rodders who want to dominate the boulevard and be the showstopper that leaves everyone talking.
  
  

Built Tough, Built Right

Both the Hot Rod and Extreme versions share the same bulletproof base: a 408-cubic-inch stroker built for punishment. Inside, the 4340 forged crankshaft, H-beam rods, and Icon forged pistons form a fully forged rotating assembly designed to handle all the abuse you can throw at it. Smeding’s CNC-ported 11° LS3 heads top it off, featuring 255cc intake runners and high-flow 2.165” valves for maximum airflow.

The 500HP Hot Rod version gets a custom hydraulic roller cam for smooth, street-friendly power, while the Extreme cranks it up with a rowdier grind to wring out every bit of performance. It’s the same sturdy foundation, just tuned to your style.

Modern Power with Classic DNA

Smeding’s 408 LS3 engines don’t just pack power—they bring hot rods into the 21st century. Both versions feature Edelbrock’s Pro-Flo 4 EFI system: a sequential port injection setup that’s dyno-tuned and ready to go out of the box. Say goodbye to fiddling with carbs or throttle-body systems. With Pro-Flo 4, you get modern drivability and efficiency in a system even first-time builders can install.

Fully Turnkey, Hassle-Free Installation

Smeding delivers more than an engine—they deliver a complete solution. Every 408 LS3 comes pre-fitted with the Holley Mid-Mount serpentine system, including an LT1-style water pump, 1-wire alternator, SD7 A/C compressor, and Type II power steering. No custom brackets. No guesswork. Just drop it in, bolt it up, and fire it.

Power and Peace of Mind

These engines don’t just make dyno numbers—they’re built to last. Backed by a 3-year, unlimited-mile warranty, Smeding’s 408 LS3 packages give you the confidence that comes with unmatched engineering and testing.

Which One Fits Your Build?

The 408” LS3 Hot Rod offers 500 horsepower with smooth drivability, ideal for builders who want muscle without compromises. The 408” LS3 Extreme adds an extra 60 ponies and plenty of attitude for those who demand more power and performance.

Your Hot Rod Deserves This Engine

Why settle for almost right? The 408” LS3 from Smeding Performance is a turnkey solution that takes your build from good to legendary. Whether you go for the 500HP Hot Rod version or the 560HP Extreme, this is the engine to make your hot rod unforgettable.

Don’t just build a car. Build a legacy. Drop in a Smeding 408 LS3 and let the horsepower do the talking.