New LS Swap Performance Crate Engines and Transmissions Now Available!

You’ve spent weekends toiling over your project car. When it’s finally time to drop in the heart of your build, you don’t want just enough power – you want something that commands respect when you turn the key.

That’s exactly why we’re thrilled to join the performance game. We’ve taken our reputation for rock-solid, OEM-quality reliability and cranked the dial. From street cruisers to forced-induction monsters, our new LS Performance Lineup has you covered.

Here is a breakdown of what we’re bringing to the table:

The Street Spec Series: Bolt-in Muscle

If you want to wake up your daily driver or restomod without sacrificing drivability, our Street Spec line is where you start. These aren’t just refreshed stock blocks; they exceed OEM specs and come with improved oiling, upgraded valvetrains, and our exclusive profile camshafts pre-installed.

• 5.3L Street Spec: Based on the LM7 long block, this setup is good for around 400 HP. It’s the perfect balance of modern reliability and classic V8 punch.
• 6.0L Street Spec: Stepping up to the LQ9 block, this combo pushes 475 HP. It comes with cathedral port heads and handles increased cam lifts with ease.

The Boost Ready Series

Planning to strap a turbo or a supercharger to your build? You need a bottom end that won’t scatter across the highway when you hit full boost. Our Boost Ready® blocks are bored, diamond-honed, and packed with forged internals to handle serious pressure.

• Boost Ready® 370: A 6.0L LQ4 block featuring Gen IV rods, forged Power Pack pistons, and ARP hardware. Safely rated for up to 750 HP.
• Boost Ready® 408: We stroke it out to 408 cubic inches with a 4340 steel crankshaft and shot-peened I-beam rods. Safely rated for up to 900 HP.
• Pro Class 408 RS: The heavy hitter. Callies Apex forged crank, Callies Compstar rods, Manley Extreme Duty valves, and custom Powertrain portwork on LS3-style heads. This absolute unit is safely rated for up to 1200 HP.

Transmissions That Can Take the Abuse

A high-power engine needs a transmission that won’t slip on the first hard pull. Our performance transmissions are built specifically to handle the torque our LS engines put down.

We offer the 4L80E and 6L80E in two distinct tiers:

1. Street Spec: Ideal for builds up to 750 HP. Features pro valve bodies, red race clutches, Kolene steels, hardened sprag races, and a 2800-RPM stall converter to get you off the line quickly.
2. Race Spec: Built for the 900 HP club. The Race Spec 4L80E and 6L80E feature billet pump rotors, high-capacity clutch kits, billet pistons, and everything you need to confidently launch at the track.

Everything You Need to Complete the Swap

We aren’t just stopping at the long blocks. To make your LS swap as seamless as possible, we’re fully stocked on the accessories you need to finish the job right:

• Cast aluminum oil pans (accommodating up to a 4.00″ stroke)
• Modular intake manifolds for EFI or carbureted tops
• Cast aluminum timing and valve covers to ditch the factory plastic
• Compact drive kits available in low, mid, and high-mount setups

We engineer these engines to perform and build them to last. If you’re ready to stop dreaming about your build and start tearing up the asphalt, give our team a call at 888-842-0023 for a free price quote, or browse the full Performance Lineup on our site.

Let’s build something loud.