Ultimate Guide to Upgrading the Chevy LS3 6.2L V8 to 700+ HP

Date September 20, 2024
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Ultimate Guide to Upgrading the Chevy LS3 6.2L V8 to 700+ HP

Ultimate How-To for Installing a 700+ HP Upgrade for the Chevy LS3 6.2L V8

Working Crate Engines, Mod Kits, and Power Recipes

🔥 Why the LS3 6.2L V8 is the Go-To Engine

The Chevy LS3 6.2L V8 is probably the favorite of all the new small-block engines in GM’s legendary LS series—and for good reason. Straight out of the factory, it delivers 430 horsepower and 425 lb-ft of torque in a light package with great reliability and an immense aftermarket. Upgrading the Chevy LS3 6.2L V8

But be honest. You didn’t end up here because you enjoy 430 HP.

You’re considering 700+ HP, and you want it reliably. If you’re building a street monster, a weekend toy, or a high-horsepower LS swap project, this is your reference guide. We’re going to walk you through:

  • What the LS3 engine can do
  • Step-by-step how to bring it to 700+ horsepower
  • What you’ll need
  • And how we can supply you with LS3 crate engines, performance kits, and pro support

🛠️ We Sell Chevy LS3 Crate Engines & Performance Kits

Just a heads up before we get into the nitty-gritty:

We’re an upper-level supplier of Chevy LS3 crate engines, complete build kits, and LS3 tuning packages. Whether you’re performing a resto-mod, an LS swap, or pushing the Camaro, Corvette, or G8 to the next level—whatever your need, we’ve got it covered. Upgrading the Chevy LS3 6.2L V8

Here’s what we offer:
✅ New LS3 crate engines
✅ Top-end kits, superchargers, camshafts
✅ Engine tuning and calibration tool support
✅ Long blocks, short blocks & swap harnesses
✅ Master guidance and nationwide shipping

Ready to shop? Jump to the bottom—or keep reading and find out how to get your LS3 to 700+ HP in style.

⚙️ What Makes the LS3 6.2L So Special?

Initially employed in the 2008 Corvette and later by the Camaro SS and other performance models of GM, the LS3 became the builders’ naturally aspirated V8 engine of choice globally.

🧾 LS3 Base Engine Specifications

SpecValue
Displacement6.2 liters (376 cubic inches)
Horsepower (Factory)430 HP @ 5,900 RPM
Torque (Factory)425 lb-ft @ 4,600 RPM
Compression Ratio10.7:1
Cylinder HeadsAluminum rectangular port (L92)
Fuel SystemSequential Fuel Injection (SFI)
Redline~6,600 RPM
Block MaterialAluminum

The LS3’s powerful heads, bigger bore, and durable rotating assembly form a good basis for both N/A and forced-induction builds.

⚡️ 700+ HP LS3 Build: Two Proven Routes

There are two main routes to 700+ horsepower out of an LS3:

  • Route 1: Naturally Aspirated (N/A) with Aggressive Mods
  • Route 2: Forced Induction (Supercharger or Turbo) with Supporting Mods

Let’s cover both—plus the parts we sell and recommend for each stage.

🧨 LS3 N/A Build to 700 HP (Race/Track Use)

This is the all-motor path. It’s expensive, loud, and race-focused—but achievable.

🔩 Mods Required:

  • Ported Heads (CNC’d LS3 or aftermarket heads)
  • Aggressive Camshaft (0.600+ lift, ~250+ duration)
  • High-RPM Valve Springs, Lifters, Pushrods
  • High-Rise Intake Manifold (FAST LSXR 102mm or Holley)
  • 102mm Throttle Body
  • Long-Tube Headers & Full Exhaust
  • High-Flow Fuel Injectors (60 lb/hr or more)
  • High-RPM ECU Tune
  • Forged Pistons & Rods (optional but strongly recommended)
  • E85 or Race Fuel Conversion

Estimated Output: ~680–715 HP @ crank
Best For: Race or track use
Note: Not recommended for pump gas or daily drivers

✅ We provide complete cam kits, CNC-ported heads, intake parts, and forged rotating assemblies for LS3 N/A engines.

🔧 LS3 + Supercharger = 700+ HP on Pump Gas

Most builders will opt for this route. Make it street-friendly and still dominate the dyno.

⚙️ Recommended Setup:

  • LS3 Crate Engine (Stock Bottom End is Fine to ~750 HP)
  • Positive Displacement Supercharger Kit (Magnuson TVS2300, Whipple 2.9L, Edelbrock E-Force)
  • LS3 Supercharger Camshaft
  • Strong Valve Springs, Pushrods, Retainers
  • 60–80 lb/hr Injectors
  • High-Flow Fuel Pump (e.g. Walbro 450 or Dual Setup)
  • Oil Cooler & Trans Cooler
  • Intercooler System
  • ECU Tune (HP Tuners, EFI Live, or Custom)
  • Cold Air Intake + Long Tube Headers

Estimated Output: 700–750 HP on 91–93 octane pump gas
✅ Daily-drivable and reliable for street or strip

🔩 Our LS3 Supercharged Build Packages

We offer complete LS3 supercharged power packages:

✅ LS3 6.2L Crate Engine (430 HP base)
✅ Whipple, Magnuson, or Edelbrock Supercharger Kit
✅ Supercharger Camshaft & Valvetrain Kit
✅ Tuning Support (HP Tuners, Plug & Play ECU)
✅ Fuel System Upgrades
✅ Belts, Pulleys, Gaskets, Sensors

Estimated Output: 720–750 HP

🧰 Ask about our turnkey engine packages with shipping, dyno testing, and full tech support.

🧱 Additional Power & Reliability Enhancements

💡 Supporting Enhancements to Consider:

  • Forged Pistons & Rods: LS3 internals will allow 700 HP, but forged gives extra durability
  • ARP Head Studs: Prevent head lift on boost
  • Oil Pan Baffles: Improve oil control under high G-forces
  • Better Radiator & Fans: Keeps engine temps safe
  • Transmission & Torque Converter: Especially critical for auto builds

🚗 What Cars Can Run the LS3?

The LS3 is one of the most sought-after swap engines today. Use it in:

  • 2010–2015 Camaro SS
  • 2008–2013 Corvette C6
  • Pontiac G8 GT
  • Chevy SS Sedan
  • Classic Muscle Cars (Chevelle, Nova, El Camino)
  • 4×4 and truck applications
  • Custom Kit Cars & Restomods
  • Off-road Baja trucks

➡️ We also provide LS3 swap kits with motor mounts, oil pans, wiring harnesses, and ECU packages.

🔍 LS3 Engine Options We Offer

🆕 Brand-New LS3 6.2L Crate Engine (GM Performance)

  • 430 HP / 425 lb-ft
  • Aluminum Block
  • Intake to Oil Pan everything included
  • Part #: 19419862

➡️ Perfect for street cars or boosted upgrades

🔧 LS3 Long Block Assemblies

  • Complete short block + heads, fully assembled
  • Add your own intake and accessories
  • Available with forged internals

➡️ Perfect for rebuilds or custom builds

⚙️ LS3 Short Block

  • Bare rotating assembly (block, pistons, rods, crank)
  • Available with stock or forged internals

➡️ Ideal for turbo or blower builds where you’re custom-building the top end

🧠 LS3 Build Calibrations & Tuning

We support HP Tuners, EFI Live, and stand-alone ECUs. Our tuning options include:

  • Injector scaling
  • Boost and spark adjustment
  • MAF/VE table calibration
  • Transmission tuning (for auto installations)

➡️ Ask us about remote tuning or pre-tuned ECUs for your setup.

💰 Why Buy Your LS3 Engine From Us?

We’re more than an internet-based parts company—we’re a full-performance engine builder and supplier.

✅ What You’ll Get:

  • LS3 crate engines, long blocks, short blocks
  • Supercharger kits, cams, heads, fuel systems
  • Tuning support and builder advice
  • LS swap kits for any project
  • Fast nationwide shipping
  • Real support from real gearheads

📞 Call or message us today—we’ll help spec out your full build.

⭐ Customer Feedback

“Picked up an LS3 crate engine and supercharger kit for my Chevelle build—made 735 HP and runs on pump gas. Super clean install too!”
— David R., Denver, CO

“They helped me build my entire LS3 swap on my ’68 Camaro. Fit was flawless and customer service was great.”
— Janelle T., Orlando, FL

🧾 How to Order Your LS3 700+ HP Build

  1. Shop our LS3 crate engine and performance kits
  2. Call or text our team for a free consultation
  3. Order and schedule your delivery
  4. Install your kit with our techs’ full support
  5. Tune it, crank it, and unleash it

🔚 Final Thoughts: Why LS3 + Boost = Bang for Your Buck

If you’re seeking 700 horsepower, the LS3 6.2L is one of the most affordable, dependable, and upgradeable platforms you can lay your hands on right now. Paired with the right supercharger, cam kit, and tuning—you’re not just pushing numbers around, you’re building a genuine modern American muscle beast.

✅ We offer the motors, the kits, and the expertise to bring you there.

🚀 Are You Ready to Build Your 700+ HP LS3 Monster?

Buy our LS3 engine kits today or discuss a free build consultation with one of our staff members. We’ll take you through choosing the right parts, designing the perfect combination, and having it delivered to your doorstep—fast.