Best Main Stud Kits

Looking for the best main stud kits to boost your engine’s strength and reliability? Discover top-tier options engineered for durability, precision, and unmatched performance in every build.

Main stud kits secure your engine’s heart. They boost strength and longevity under pressure. Built for power or daily use, these kits deliver rock-solid reliability.

High-strength steel and precision engineering ensure zero flex. Top brands like ARP and Speedmaster lead with race-tested designs. Every kit promises tighter clamps and safer performance.

Drivers love the swap-and-go ease. From LS swaps to track builds, these kits cut stress and boost trust. Ready to lock in unshakable power? Dive in to find your engine’s perfect match.

List of Top 10 Main Stud Kits

Title	Best For	Price
Michigan Motorsports LS Main Bolt & Stud Kit – Fits 1997-2013 LS Engines – 4.8L 5.3L 5.7L 6.0L 6.2L LS1 LS2 LS3 LQ4 LM7 LC9 LR4 L96 L76 – Durable Factory Replacement	Mechanics and LS engine builders upgrading or fixing 1997-2013 GM engines. Perfect for high-performance builds, daily drivers, or forced-induction setups needing stronger main bolts and studs.	View on Amazon (paid link)
Chevy Gen III/LS Series Small Block Main Stud Kit – Xotic Performance™ MS334	This Chevy Gen III/LS Series Small Block Main Stud Kit is perfect for car enthusiasts and mechanics who want to upgrade their engine’s performance and reliability. It’s ideal for those with 1997 to current Chevrolet Gen III/LS engines looking for superior strength and easy installation.	View on Amazon (paid link)
ARP 2345608 Stud Kit	The ARP 2345608 Stud Kit is perfect for car enthusiasts and mechanics working on SB Chevy LS1 engines. This vehicle-specific kit ensures a precise fit and durable performance for cast iron main applications.	View on Amazon (paid link)
Speedmaster PCE287.1024 Main Stud Kit	This product is perfect for car enthusiasts and engine builders working on GM LS, LS1, LS2, LS6, LS7, LSX, GEN engines. It offers 4-bolt main caps with high-strength studs rated at 190,000 PSI, ensuring precise performance under extreme conditions.	View on Amazon (paid link)
ARP 134-5402 Main Stud Kit for Small Block Chevy	This product is perfect for mechanics and car enthusiasts upgrading or rebuilding Small Block Chevy engines. It provides a precise fit, is Made in USA, and ensures strong, reliable performance with easy installation.	View on Amazon (paid link)
Speedmaster PCE287.1004 Compatible with Chevy BBC 454 4 Bolt 12 Point Main Stud Kit	This product is perfect for Chevy big-block engine builders and racers who need strong, reliable fasteners for high-performance engines. Its Track Proven technology ensures long-lasting durability under tough conditions, backed by a 12-month warranty for peace of mind.	View on Amazon (paid link)
Speedmaster PCE287.1024 LS LS1 LS2 LS6 LS7 LSX GEN III 12 Point Main Stud Kit	This main stud kit is perfect for car enthusiasts who want reliable engine performance. It’s ideal for upgrading LS engines with stronger fasteners.	View on Amazon (paid link)
ARP 203-5405 Main Stud Kit	Perfect for Toyota Supra 2JZ A80 owners needing strong, reliable engine upgrades. This made-in-USA stud kit ensures durable performance for high-powered builds.	View on Amazon (paid link)
Main Cap Fastener Kits \| SBC Main Stud Kit ’67-’97 5.7L LT1/LT4 \| 12-Point Nuts \| 4-Bolt Mains \| Chromoly \| Black Oxide \| Compatible with GM LT-Series \| Kit	Car enthusiasts and mechanics working on GM LT-Series engines need this kit. It ensures strong, reliable performance with easy, direct-fit installation for daily drivers or high-stress builds.	View on Amazon (paid link)
ARP 203-5407 Main Stud Kit	This ARP 203-5407 Main Stud Kit is ideal for Toyota 1.8L 2ZZGE DOHC 4-cyl engine builders who want a vehicle-specific fit. It ensures reliable performance with exact specs and the right part number for easy matching.	View on Amazon (paid link)

Detailed Reviews

Looking for the best main stud kits? We’ve reviewed top picks for LS engines, Small Block Chevy, and more. Each kit is tested for strength, ease of install, and long-term reliability. From ARP to Speedmaster, find trusted brands that deliver race-ready performance and factory-fit precision. Whether you’re building a daily driver or a high-horsepower beast, our guide highlights the top 10 options to keep your engine secure. Bold choices. Clear insights. Trusted results.

1. Michigan Motorsports LS Main Bolt & Stud Kit – Fits 1997-2013 LS Engines – 4.8L 5.3L 5.7L 6.0L 6.2L LS1 LS2 LS3 LQ4 LM7 LC9 LR4 L96 L76 – Durable Factory Replacement

Michigan Motorsports LS Main Bolt & Stud Kit - Fits 1997-2013 LS Engines - 4.8L 5.3L 5.7L 6.0L 6.2L LS1 LS2 LS3 LQ4 LM7 LC9 LR4 L96 L76 - Durable Factory Replacement

This kit gives your LS engine maximum bottom-end security with a mix of main bolts and studs. It fits 1997-2013 LS engines, including 4.8L to 6.2L models like LS1, LS3, and LQ4. Main studs boost block stability, cutting down on crankshaft issues and main cap movement.

Built from high-strength steel, these parts resist heat, stretching, and heavy torque. Perfect for stock engines or high-horsepower builds, this kit ensures long-term engine reliability.

Pros	Cons
Complete kit ensures strong engine security with durable bolts and studs. Fits 1997-2013 LS engines (4.8L-6.2L) including LS1, LS3, LQ4. Main studs reduce cap movement for high-RPM and boosted setups. High-strength steel resists stretching and heavy torque loads. Perfect for stock or performance builds, ensuring long-term reliability.	Mix of bolts and studs may not suit all engine builds. Limited to specific LS engine models; not universal fitment.

Perfect For:

Mechanics and LS engine builders upgrading or fixing 1997-2013 GM engines. Perfect for high-performance builds, daily drivers, or forced-induction setups needing stronger main bolts and studs.

Ready to Purchase?

View Price on Amazon (paid link)

2. Chevy Gen III/LS Series Small Block Main Stud Kit – Xotic Performance™ MS334

Direct Fit Replacement: Fits 1997+ Chevy Gen III/LS engines like LS1, LS2, LS3, and more. Ultra Strength: Made from XOTIC 7200 material, rated at 220,000 psi tensile strength for extreme durability. Better than bolts: Offers higher clamping force than standard 8740 chromoly steel.

Easy Installation: Broached stud ends ensure quick, precise setup. Prevents shifting: Stops main caps from moving under stress for safer engine performance. Stationary design: Studs stay fixed, improving thread life and alignment over bolts.

Not for cylinder heads: This is a main bearing cap stud kit only. Includes instructions for hassle-free installation.

Pros	Cons
Direct Fit for Chevy Gen III/LS Engines (1997–Current Models) Ultra Strong XOTIC 7200 Material (220,000 psi Tensile Strength) Easy Installation with Broached Ends & Detailed Manual Prevents Main Cap Shifting Under Extreme Loads	Not for head studs, only for main bearing caps. Requires precise installation, even with broached ends. Higher cost than standard chromoly bolts.

Perfect For:

This Chevy Gen III/LS Series Small Block Main Stud Kit is perfect for car enthusiasts and mechanics who want to upgrade their engine’s performance and reliability. It’s ideal for those with 1997 to current Chevrolet Gen III/LS engines looking for superior strength and easy installation.

Ready to Purchase?

View Price on Amazon (paid link)

3. ARP 2345608 Stud Kit

ARP 2345608 Stud Kit fits Chevy LS1 engines. It uses cast iron main studs for strong support. This kit ensures a vehicle-specific fit for reliable performance.

The package weighs 4.15 pounds and includes all needed parts. Part number 2345608 makes ordering simple and precise.

Pros	Cons
SB Chevy LS1 compatible for precise fit Cast iron strength ensures long-lasting performance Vehicle-specific design offers reliable installation Lightweight 4.15 lbs for easy handling Includes part number 2345608 for accurate ordering	Heavyweight design – 4.15 lbs may complicate installation Limited compatibility – Fits only specific Chevy LS1 models Cast iron material – May lack strength vs. steel alternatives

Perfect For:

The ARP 2345608 Stud Kit is perfect for car enthusiasts and mechanics working on SB Chevy LS1 engines. This vehicle-specific kit ensures a precise fit and durable performance for cast iron main applications.

Ready to Purchase?

View Price on Amazon (paid link)

4. Speedmaster PCE287.1024 Main Stud Kit

This is a main stud kit for GM LS engines. It uses aircraft-quality 8740 chromoly steel. The kit handles up to 190,000 PSI and includes nuts and washers.

The 4-bolt design ensures strong crankcase support. Each stud is thread-rolled after heat treatment for exact fit.

4130 steel washers stay flat under pressure. The kit delivers race-ready reliability for high-performance builds.

Pros	Cons
Premium aircraft-grade 8740 chromoly steel for extreme durability Withstands up to 190,000 PSI for high-stress performance 4-bolt compatibility with GM LS series engines ensures broad use Includes 12-point nuts and 4130 washers for easy setup Thread-rolled after heat treatment ensures precise torque readings	High price compared to standard bolts Limited compatibility with non-GM engines Requires specialty tools for installation

Perfect For:

This product is perfect for car enthusiasts and engine builders working on GM LS, LS1, LS2, LS6, LS7, LSX, GEN engines. It offers 4-bolt main caps with high-strength studs rated at 190,000 PSI, ensuring precise performance under extreme conditions.

Ready to Purchase?

View Price on Amazon (paid link)

5. ARP 134-5402 Main Stud Kit for Small Block Chevy

The ARP 134-5402 Main Stud Kit is a must-have for Small Block Chevy engines. It’s made in the USA, ensuring top quality and reliability.

This main stud/bolt kit comes in a compact package, measuring 22.3 H x 5.9 L x 10.8 W centimeters. The part number ARP-134-5402 makes it easy to identify for your project.

Pros	Cons
ARP Quality: Trust in American-made precision for your engine. Perfect Fit: Designed specifically for Small Block Chevy engines. Compact Size: Easy to handle and store with compact packaging. Complete Kit: Includes all main studs/bolts needed for installation.	Large package dimensions may cause fit issues. Only compatible with Small Block Chevy engines.

Perfect For:

This product is perfect for mechanics and car enthusiasts upgrading or rebuilding Small Block Chevy engines. It provides a precise fit, is Made in USA, and ensures strong, reliable performance with easy installation.

Ready to Purchase?

View Price on Amazon (paid link)

6. Speedmaster PCE287.1004 Compatible with Chevy BBC 454 4 Bolt 12 Point Main Stud Kit

The Speedmaster PCE287.1004 fits Chevy BBC 454 4-bolt engines. It includes 287 Main Cap Fasteners for strong, secure performance. Built to handle tough conditions, this kit ensures lasting reliability.

Speedmaster blends old and new tech to create bold, innovative parts. Their 12-point main studs offer easy installation and high strength. Every product is TRACK PROVEN, tested for real-world use.

Backed by a 12-month Limited Worldwide Warranty, this kit is trusted by racers and builders. Designed for power and precision, it works for racing, street, or off-road builds. Speedmaster stands for quality you can count on.

Pros	Cons
Compatible with Chevy BBC 454 4-Bolt engines Track Proven durability for road, race, and recreation High-strength 287 main cap fastener included Innovative blend of old and new technology 12-month limited worldwide warranty	Limited compatibility with Chevy BBC 454 4 Bolt engines only. 12-Month warranty may feel short compared to similar products. 12-Point design could require specialized tools for installation.

Perfect For:

This product is perfect for Chevy big-block engine builders and racers who need strong, reliable fasteners for high-performance engines. Its Track Proven technology ensures long-lasting durability under tough conditions, backed by a 12-month warranty for peace of mind.

Ready to Purchase?

View Price on Amazon (paid link)

7. Speedmaster PCE287.1024 LS LS1 LS2 LS6 LS7 LSX GEN III 12 Point Main Stud Kit

The Speedmaster PCE287.1024 is a 12-point main stud kit designed for GEN III engines. It includes a 287 main cap fastener, ensuring strong and reliable performance.

This kit is track proven, tested for road, race, and recreation. It comes with a 12-month limited worldwide warranty. Speedmaster blends old and new technology for unique and durable products.

Pros	Cons
287 Main Cap Fastener ensures secure and reliable engine performance. Track Proven durability for road, race, and recreation use. 12-Month Worldwide Warranty offers peace of mind. Innovative Design blends old and new tech for uniqueness. Empowered Workmanship drives product innovation and quality.	Limited compatibility with non-LS engine models Professional installation required for optimal performance Higher cost compared to standard fastener kits

Perfect For:

This main stud kit is perfect for car enthusiasts who want reliable engine performance. It’s ideal for upgrading LS engines with stronger fasteners.

Ready to Purchase?

View Price on Amazon (paid link)

8. ARP 203-5405 Main Stud Kit

Fit type: Fits Toyota Supra 2JZA80. Made in United States ensures quality. Package Weight is 2.43 lbs.

Package dimensions are 10.668 cm L x 21.59 cm W x 5.842 cm H. Small size makes storage and handling easy.

Pros	Cons
ARP 203-5405 fits Toyota Supra 2JZA80 perfectly. Made in the USA for top-notch quality. Compact size, easy to handle and store. Lightweight at 2.43 lbs, yet durable and strong.	Mixed Units: Uses cm and lbs, confusing some buyers. Limited Compatibility: Only fits Toyota Supra 2JZ A80. Bulky Packaging: Takes up more space than needed.

Perfect For:

Perfect for Toyota Supra 2JZ A80 owners needing strong, reliable engine upgrades. This made-in-USA stud kit ensures durable performance for high-powered builds.

Ready to Purchase?

View Price on Amazon (paid link)

9. Main Cap Fastener Kits | SBC Main Stud Kit ’67-’97 5.7L LT1/LT4 | 12-Point Nuts | 4-Bolt Mains | Chromoly | Black Oxide | Compatible with GM LT-Series | Kit

The Main Cap Fastener Kit is a direct OE replacement for your engine. It matches factory specs to restore your vehicle’s original look and function. This kit is designed for easy fitment, saving you time and hassle.

Built from durable chromoly with a black oxide finish, this kit is quality tested for reliable performance. It’s engineered to handle daily use and high-stress driving, ensuring a secure, high-performance fit.

Compatible with GM LT-Series, this kit includes 12-point nuts and 4-bolt mains. It’s trusted for long-lasting strength and dependability.

Pros	Cons
Direct OE Replacement restores factory look and function Quality Tested for dependable performance and accurate fit Easy Fitment requires no modifications or extra effort Secure Fit handles high-stress driving without loosening Durable Chromoly construction ensures long-term reliability	Higher cost than standard fastener options. Limited compatibility with non-GM engines. 12-point nuts may require specialty tools.

Perfect For:

Car enthusiasts and mechanics working on GM LT-Series engines need this kit. It ensures strong, reliable performance with easy, direct-fit installation for daily drivers or high-stress builds.

Ready to Purchase?

View Price on Amazon (paid link)

10. ARP 203-5407 Main Stud Kit

ARP 203-5407 Main Stud Kit fits Toyota 1.8L 2ZZGE DOHC 4-cyl engines. Part number: 203-5407 ensures a precise, vehicle-specific fit. This kit weighs 2.06 pounds for easy handling.

Built for reliability, it upgrades engine durability. Vehicle Specific design matches factory specs. Lightweight at 2.06 pounds, it’s simple to install.

Pros	Cons
Vehicle-specific fit ensures perfect compatibility. Lightweight design at just 2.06 pounds. Durable construction for long-lasting performance. Precise part number (203-5407) matches Toyota engines. Trusted ARP brand delivers reliable quality.	Limited application to Toyota 1.8L 2ZZGE engines only Heavier package (2.06 pounds) vs. lighter alternatives No universal fit across other vehicle models or engines

Perfect For:

This ARP 203-5407 Main Stud Kit is ideal for Toyota 1.8L 2ZZGE DOHC 4-cyl engine builders who want a vehicle-specific fit. It ensures reliable performance with exact specs and the right part number for easy matching.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Main stud kits are engine essentials. They lock in power and protect performance under pressure.

High-Strength Materials: Look for steel alloys like 8740 chromoly or XOTIC 7200. These resist heat, stretching, and heavy torque for long-term reliability.
Engine Compatibility: Match kits to your engine type (e.g., LS1, LS3, or Small Block Chevy). Check model years and displacement sizes (4.8L–6.2L) for a perfect fit.
Installation Simplicity: Choose kits with broached ends or pre-assembled parts. These cut swap stress and ensure quick, precise setup without special tools.
Clamping Force: Higher tensile strength (like 220,000 psi) means tighter clamps and zero main cap shifting. Critical for high-horsepower or track builds.
Use Case: Decide between daily drivers or race-ready designs. Kits with black oxide finishes or 4130 steel washers suit extreme conditions.
Warranty and Brand Trust: Top brands like ARP and Speedmaster offer race-tested kits with 12-month warranties. Backed by proven durability for peace of mind.