Best LS LT Engine Upgrades: 10 Top Performance Boosters

Want to know the best LS LT engine upgrades? We’ve got you covered with a guide to 10 top upgrades that will boost your engine’s performance and unlock its full potential.

Looking to boost your LS or LT engine’s performance? You’re in the right place. This guide highlights the best upgrades to take your engine to the next level.

From precision-machined trunnion kits to high-flow fuel pumps, these upgrades are built to last and easy to install. Get ready to unlock your engine’s full potential.

List of Top 10 LS LT Engine Upgrades

Title	Best For	Price
CHE 4290 LS/LT Bushing Trunnion Kit \| Fits GM LS/LT Engines 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L \| Precision CNC Machined for Maximum Durability & Performance \| Full Set of 16	This bushing trunnion kit is perfect for anyone with a GM LS/LT engine who wants maximum durability and performance. It’s ideal for high-RPM use and aggressive cam profiles, giving you reliable valvetrain performance under extreme conditions.	View on Amazon (paid link)
Michigan Motorsports LS/LT Beehive Valve Seal Kit \| Set of 16 \| Hat-Style Stem Seal for 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L LS & Gen V LT Engines \| OEM-Style Powdered Metal Guide Fit	This kit is perfect for LS and LT engine builders who want a reliable seal during spring upgrades or full top-end rebuilds. It’s made for performance enthusiasts who demand OEM fit and leak-free durability.	View on Amazon (paid link)
Michigan Motorsports 7 Degree Valve Locks/Keepers – Compatible with LS1 LS2 LS3 LQ4 LQ9 L83 L86 – Fits BTR TSP Pac Dual & Beehive Spring Retainers – 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L LS/LT Engines	This product is perfect for anyone upgrading or refreshing their LS or LT engine. It’s ideal for high-performance builds needing reliable valve locks that work with dual or beehive springs.	View on Amazon (paid link)
CHENACC 12PCS 5.3/6.0 Ls Header Bolt, Ls Exhaust Manifold Bolts Manifold Header Bolts 551696 for GM LS1 LS3 LS2 LSX LT Series Engine, Grade 10.9 LS Head Bolts Replaces ICT Billet	This product is perfect for car enthusiasts and DIY mechanics who need reliable, high-strength bolts for their GM LS or LT engines. It’s easy to install and built to last, making it ideal for anyone upgrading or replacing exhaust manifold bolts.	View on Amazon (paid link)
Lanotech 450LPH Fuel Pump Hanger & Sending Unit for 73-91 Chevy GMC C10 K10 C20 K20 C30 K30 Truck – LS/LT Swap, AN Fittings, E85, In-Tank Electric Pump Kit	This kit is perfect for Chevy & GMC truck owners who want a simple LS/LT swap with big horsepower and reliable fuel delivery. It’s made for builders who need E85 compatibility, plug-and-play install, and leak-free AN fittings without hassle.	View on Amazon (paid link)
Oil Diverter Barbell 6061-T6 Aluminum Alloy for GM Gen III & IV LS Engines – Fits LS1 LS2 LS3 LS6 LQ4 LQ9 L92 L99 4.8L 5.3L 5.7L 6.0L 6.2L – Billet Rear Galley Plug Performance Upgrade	This Oil Diverter Barbell is perfect for car enthusiasts and DIY mechanics who want a reliable upgrade for their GM LS engines. It’s easy to install and works great for daily drivers or high-performance vehicles.	View on Amazon (paid link)
ICT Billet 5ft Universal Spark Plug Wire Set – LS LT Remote Coil Spiral Core Straight 90 135 Boots Compatible with LS1 LM7 LQ4 LS6 LQ9 LM4 LS2 LS3 LY6 LC9 LH8 LMG L99 551083	This set is perfect for LS and LT engine builders who want strong, reliable spark plug wires that fit every setup. It’s made for performance lovers who demand USA-made quality and easy installation.	View on Amazon (paid link)
MHWTSS Heater Core Bypass Hose with 2 Clamps for LS and LT Series Engines, 551699 Coolant Crossover U Shape Hose with 5/8 and 3/4 Ends for Engine Cooling System	This MHWTSS Heater Core Bypass Hose is perfect for car owners with LS or LT engines. It’s ideal for anyone needing to bypass the heater core in their cooling system.	View on Amazon (paid link)
BTR LS & LT TK001 Rocker Trunnion Kit	This kit is perfect for LS and Gen V LT engine builders who want a strong, reliable upgrade. It’s made for serious performance work, but remember—bolts are not included.	View on Amazon (paid link)
BTR Brian Tooley Racing LS LT Rocker Trunnion Easy Bearing Install Tool \| Fits LS & Gen V LT Engines \| Precision Rocker Trunnion Service Tool	This tool is perfect for anyone working on LS or LT engines. It’s ideal for mechanics, builders, or DIY enthusiasts who need to upgrade or rebuild rocker trunnions with ease and precision.	View on Amazon (paid link)

Detailed Reviews

Discover the Best LS LT Engine Upgrades chosen with expert care and real customer feedback. Each part is reviewed for performance, durability, and value. This guide makes it easy to pick the right upgrade for your build. Read on and find the perfect upgrade for your LS or LT engine.

1. CHE 4290 LS/LT Bushing Trunnion Kit | Fits GM LS/LT Engines 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L | Precision CNC Machined for Maximum Durability & Performance | Full Set of 16

CHE 4290 LS/LT Bushing Trunnion Kit | Fits GM LS/LT Engines 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L | Precision CNC Machined for Maximum Durability & Performance | Full Set of 16

Upgrade your GM LS/LT engine with the CHE 4290 Bushing Trunnion Kit. This complete kit replaces all 16 rocker arms, boosting reliability and performance. It’s CNC machined for precision and built to handle high-RPM demands.

Made with CHE’s proprietary material, this kit ensures longevity and wear resistance. Track-tested and Made in the USA, it’s the trusted choice for professional racers and engine builders.

Pros	Cons
Upgrades all 16 rocker arms for reliable engine performance. Precision CNC parts ensure rock-solid stability under stress. Proprietary material boosts durability and wear resistance. Track-tested and racer-approved for extreme demands. Made in the USA with premium quality control.	Higher cost than stock parts, but worth it for performance. Requires skill for installation, not a quick fix. Overkill for daily drivers, best for high-performance builds.

Perfect For:

This bushing trunnion kit is perfect for anyone with a GM LS/LT engine who wants maximum durability and performance. It’s ideal for high-RPM use and aggressive cam profiles, giving you reliable valvetrain performance under extreme conditions.

Ready to Purchase?

View Price on Amazon (paid link)

2. Michigan Motorsports LS/LT Beehive Valve Seal Kit | Set of 16 | Hat-Style Stem Seal for 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L LS & Gen V LT Engines | OEM-Style Powdered Metal Guide Fit

Michigan Motorsports LS/LT Beehive Valve Seal Kit | Set of 16 | Hat-Style Stem Seal for 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L LS & Gen V LT Engines | OEM-Style Powdered Metal Guide Fit

This valve seal kit is built for strength. It fits LS and LT engines with ease. It keeps your valvetrain sealed tight every time.

The hat-style design works perfectly with beehive springs. It holds up even under high lift cycles.

You get a full set of 16 seals. Ideal for performance upgrades or a complete rebuild.

Pros	Cons
Seamless fit with beehive valve springs for leak-free performance. Covers Gen 3/4/5 LS/LT engines from 2001–2021. No mods needed—works with factory-style guides. Prevents oil leaks and smoking in performance builds. Complete kit—16 seals for full V8 service.	Not universal fit – Only works with OEM powdered-metal guides. Extra step needed – Must replace seals when swapping springs. Limited scope – Designed only for LS/LT engines.

Perfect For:

This kit is perfect for LS and LT engine builders who want a reliable seal during spring upgrades or full top-end rebuilds. It’s made for performance enthusiasts who demand OEM fit and leak-free durability.

Ready to Purchase?

View Price on Amazon (paid link)

3. Michigan Motorsports 7 Degree Valve Locks/Keepers – Compatible with LS1 LS2 LS3 LQ4 LQ9 L83 L86 – Fits BTR TSP Pac Dual & Beehive Spring Retainers – 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L LS/LT Engines

Michigan Motorsports 7 Degree Valve Locks/Keepers - Compatible with LS1 LS2 LS3 LQ4 LQ9 L83 L86 - Fits BTR TSP Pac Dual & Beehive Spring Retainers - 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L LS/LT Engines

Upgrade your engine with Michigan Motorsports 7 Degree Valve Locks/Keepers. They are designed for precision and durability. Perfect for LS and LT engines.

These keepers work with dual and beehive springs. They fit BTR, TSP, PAC, and OEM setups. High-strength materials handle high RPMs and long use.

The set includes 16 valve keepers. It’s ready for your upgrade. Fits 4.8L to 7.0L engines easily.

Pros	Cons
Precision fit for secure valve stem lock Works with dual & beehive spring retainers Built tough for high-RPM performance Fits wide LS/LT engines from 4.8L to 7.0L Complete set for all 16 valves	Not for non-LS/LT engines, limiting use to specific models. Requires professional installation, not a DIY-friendly upgrade. No color options, only standard finish available.

Perfect For:

This product is perfect for anyone upgrading or refreshing their LS or LT engine. It’s ideal for high-performance builds needing reliable valve locks that work with dual or beehive springs.

Ready to Purchase?

View Price on Amazon (paid link)

4. CHENACC 12PCS 5.3/6.0 Ls Header Bolt, Ls Exhaust Manifold Bolts Manifold Header Bolts 551696 for GM LS1 LS3 LS2 LSX LT Series Engine, Grade 10.9 LS Head Bolts Replaces ICT Billet

CHENACC 12PCS 5.3/6.0 Ls Header Bolt, Ls Exhaust Manifold Bolts Manifold Header Bolts 551696 for GM LS1 LS3 LS2 LSX LT Series Engine, Grade 10.9 LS Head Bolts Replaces ICT Billet

Strong Grade 10.9 steel makes these bolts tough. They fit GM LS & LT engines from 1997-up. They are zinc plated to fight rust.

Easy to install and built to last. Perfect OEM replacement for part number 551696.

Pros	Cons
Fits GM LS/LT engines from 1997 to present. High-strength Grade 10.9 steel ensures durability. Anti-corrosion zinc plating resists rust and wear. Easy installation saves time and effort.	No washers included in the kit Limited size may not fit custom setups Basic design lacks extra performance features

Perfect For:

This product is perfect for car enthusiasts and DIY mechanics who need reliable, high-strength bolts for their GM LS or LT engines. It’s easy to install and built to last, making it ideal for anyone upgrading or replacing exhaust manifold bolts.

Ready to Purchase?

View Price on Amazon (paid link)

5. Lanotech 450LPH Fuel Pump Hanger & Sending Unit for 73-91 Chevy GMC C10 K10 C20 K20 C30 K30 Truck – LS/LT Swap, AN Fittings, E85, In-Tank Electric Pump Kit

The Lanotech 450LPH Fuel Pump Hanger & Sending Unit is a direct fit for 1973-1991 Chevy & GMC Square Body Trucks. It’s perfect for LS/LT engine swaps and works with E85 and gasoline. This plug-and-play kit installs in under 2 hours.

It includes a 450LPH high-flow fuel pump, AN fittings, and a fuel level sending unit. The durable materials ensure leak-free performance for high-horsepower engines.

Pros	Cons
Direct Fit for 73-91 Chevy & GMC trucks Supports LS/LT swaps with no tank mods E85 ready for flex-fuel builds 450LPH pump powers high-horse engines Leak-free AN fittings ensure lasting safety	Not for non-Chevy/GMC trucks, limits vehicle compatibility. Requires specific pump type (EP381), no alternatives. High flow may exceed needs for stock engines.

Perfect For:

This kit is perfect for Chevy & GMC truck owners who want a simple LS/LT swap with big horsepower and reliable fuel delivery. It’s made for builders who need E85 compatibility, plug-and-play install, and leak-free AN fittings without hassle.

Ready to Purchase?

View Price on Amazon (paid link)

6. Oil Diverter Barbell 6061-T6 Aluminum Alloy for GM Gen III & IV LS Engines – Fits LS1 LS2 LS3 LS6 LQ4 LQ9 L92 L99 4.8L 5.3L 5.7L 6.0L 6.2L – Billet Rear Galley Plug Performance Upgrade

Oil Diverter Barbell 6061-T6 Aluminum Alloy for GM Gen III & IV LS Engines - Fits LS1 LS2 LS3 LS6 LQ4 LQ9 L92 L99 4.8L 5.3L 5.7L 6.0L 6.2L - Billet Rear Galley Plug Performance Upgrade

Say goodbye to fragile plastic parts in your engine. This Oil Diverter Barbell is made from strong 6061-T6 aluminum. It’s a permanent fix for GM LS engines.

Enjoy better oil flow and higher pressure. The triple seal design stops leaks and boosts performance. It fits over 50 GM models with no changes needed.

Swap O-rings easily during rebuilds. Perfect for daily or track use. A smart upgrade for any LS engine.

Pros	Cons
Stronger than plastic, lasts a lifetime. Boosts oil pressure by up to 15%. Fits 50+ LS engines with no mods. Protects lifters and camshaft from wear. Reusable design saves money on rebuilds.	Higher cost than stock plastic part Requires engine teardown for install Not needed for low-mileage factory engines

Perfect For:

This Oil Diverter Barbell is perfect for car enthusiasts and DIY mechanics who want a reliable upgrade for their GM LS engines. It’s easy to install and works great for daily drivers or high-performance vehicles.

Ready to Purchase?

View Price on Amazon (paid link)

7. ICT Billet 5ft Universal Spark Plug Wire Set – LS LT Remote Coil Spiral Core Straight 90 135 Boots Compatible with LS1 LM7 LQ4 LS6 LQ9 LM4 LS2 LS3 LY6 LC9 LH8 LMG L99 551083

ICT Billet 5ft Universal Spark Plug Wire Set - LS LT Remote Coil Spiral Core Straight 90 135 Boots Compatible with LS1 LM7 LQ4 LS6 LQ9 LM4 LS2 LS3 LY6 LC9 LH8 LMG L99 551083

The ICT Billet 5ft Universal Spark Plug Wire Set is a reliable choice for your engine. It works with all Gen 2, 3, 4, and 5 LS and LT engines. This set is made in the USA, ensuring quality and durability.

You get 8 pieces of 5-foot-long plug wires. Each wire has a spiral core and a thick 8mm jacket. The set includes 135-degree, 90-degree, and straight boots for easy installation.

This kit has everything you need for a smooth upgrade. It’s compatible with many ignition coils, making it a versatile option for your vehicle.

Pros	Cons
Fits all LS & LT engines Extra-long 5ft wires for flexible routing Made in the USA for trusted quality Durable 8mm jacket protects against heat and wear Complete kit with multiple boots and terminals	No pre-assembled wires, requires DIY skills. Long wires may need trimming for specific setups. Bulk packaging, no storage or organization included.

Perfect For:

This set is perfect for LS and LT engine builders who want strong, reliable spark plug wires that fit every setup. It’s made for performance lovers who demand USA-made quality and easy installation.

Ready to Purchase?

View Price on Amazon (paid link)

8. MHWTSS Heater Core Bypass Hose with 2 Clamps for LS and LT Series Engines, 551699 Coolant Crossover U Shape Hose with 5/8 and 3/4 Ends for Engine Cooling System

MHWTSS Heater Core Bypass Hose with 2 Clamps for LS and LT Series Engines, 551699 Coolant Crossover U Shape Hose with 5/8 and 3/4 Ends for Engine Cooling System

The MHWTSS Heater Core Bypass Hose is made for LS and LT engines. It replaces part 551699 and helps cool your engine.

This U-shaped hose routes coolant flow. It comes with 2 metal clamps for secure installation. Use it to bypass the heater core.

Pros	Cons
Fits LS & LT engines with perfect compatibility U shape design ensures smooth coolant flow Includes 2 clamps for a tight, secure hold Bypasses heater core for efficient cooling system use	Not OEM replacement, may not fit all setups Limited use—only works for heater core bypass Basic clamps included, not heavy-duty grade

Perfect For:

This MHWTSS Heater Core Bypass Hose is perfect for car owners with LS or LT engines. It’s ideal for anyone needing to bypass the heater core in their cooling system.

Ready to Purchase?

View Price on Amazon (paid link)

9. BTR LS & LT TK001 Rocker Trunnion Kit

The BTR LS & LT TK001 Rocker Trunnion Kit is built for LS and Gen V LT engines. It’s made to handle tough use and deliver smooth performance.

Easy to install. Strong design. Bolts NOT included!

This kit gives your engine better stability and longer life. It’s a smart upgrade for serious builders.

Pros	Cons
Fits LS & Gen V LT engines with ease Boosts performance and reliability instantly Built for strength and long-lasting use Simple install with precision design	Bolts not included, so you’ll need to buy them separately. No instructions provided, making installation tricky for beginners. Limited compatibility with only LS & Gen V LT engines.

Perfect For:

This kit is perfect for LS and Gen V LT engine builders who want a strong, reliable upgrade. It’s made for serious performance work, but remember—bolts are not included.

Ready to Purchase?

View Price on Amazon (paid link)

10. BTR Brian Tooley Racing LS LT Rocker Trunnion Easy Bearing Install Tool | Fits LS & Gen V LT Engines | Precision Rocker Trunnion Service Tool

Get precision every time. This tool gives a straight-line press for trunnion bearings. No damage, no guesswork, just clean installs.

Works with LS and Gen V LT engines. Perfect for trunnion upgrades and valvetrain service. Strong build means it lasts in any shop.

Boosts consistency and performance. A must-have for serious builders.

Pros	Cons
Easy and accurate trunnion bearing installation, no damage to rocker arms. Fits LS and LT engines, perfect for upgrades and repairs. Ensures long-lasting trunnion performance with proper alignment. Durable build for repeated use in professional shops.	Not for beginners: Requires some mechanical skill and knowledge. Limited use: Only for LS and LT engines, not universal. No instructions: DIYers may struggle without guidance.

Perfect For:

This tool is perfect for anyone working on LS or LT engines. It’s ideal for mechanics, builders, or DIY enthusiasts who need to upgrade or rebuild rocker trunnions with ease and precision.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Boosting your LS or LT engine is exciting. The right upgrades make a big difference. Each part adds power, reliability, and smooth performance.

Compatibility: Always check if the upgrade fits your exact engine size (4.8L, 5.3L, 6.0L, etc.). A perfect fit means easy install and no wasted money. Wrong parts can cause damage.
Durability: Look for CNC-machined or high-strength materials. Strong parts last longer and handle high RPMs. Weak parts wear out fast and hurt performance.
Performance Gain: Choose upgrades that boost horsepower, torque, or reliability. A fuel pump adds power, while a trunnion kit adds stability. Match upgrades to your goal.
Ease of Install: Some kits are plug-and-play, others need tools. If you want quick results, pick parts with simple installation. Builders may prefer advanced kits.
Engine Use: Daily drivers need long-lasting parts. Track cars need high-RPM strength. Match the upgrade to how you use your engine.
Brand Reputation: Trusted brands like CHE, BTR, Michigan Motorsports, ICT Billet are proven. They are track-tested and used by engine builders. Good brands mean fewer problems.
Budget: Balance cost with quality. Cheap parts may fail early. Investing in strong upgrades saves money in the long run.
Maintenance: Pick parts that are easy to service. For example, oil diverter barbells with O-rings are simple to swap. Less hassle means more time driving.
Fuel Needs: If you run E85 or high horsepower, get a high-flow fuel pump. Stock pumps can’t keep up. Right fuel delivery keeps your engine safe.
Supporting Tools: Some upgrades need special tools. A trunnion install tool makes the job clean and precise. Without it, installs can be tricky.