Fits Big Block Ford 429-460 CID engines equipped with either front or rear sump oil pans.

This ARP Main Bolt Kit is engineered to provide superior bottom-end stability for Ford big block engines. Designed to replace factory hardware, these bolts offer the precise clamping force necessary to secure your main caps during high-performance use. This specific kit is versatile enough for both front and rear sump configurations and eliminates the need to source separate hardware by including the essential oil pickup standoff bolt.

• Compatible with Big Block Ford 429 and 460 CID engines
• Fits both front and rear sump oil pan applications
• Includes dedicated oil pickup standoff bolt for proper clearance and mounting
• Provides critical high-strength retention for crankshaft main caps

Fits 2007-Up Dodge Ram models equipped with the 6.7L Cummins Diesel engine utilizing a girdle.

Ensure the structural integrity of your bottom end with the ARP Main Stud Kit. Engineered specifically for 6.7L Cummins builds that use a girdle, these studs provide the precise, consistent clamping force necessary to maintain main cap alignment under high-load conditions. By replacing the factory bolts, this kit significantly reduces main cap walk, protecting your block and crankshaft from the stresses of increased boost and torque levels.

• Specifically designed for 6.7L Cummins engines equipped with a main girdle
• Manufactured to exceed OEM fastener specifications for superior tensile strength
• Reduces main cap walk to improve bearing life and block longevity
• Provides consistent clamping force for high-horsepower diesel applications
• Includes high-strength studs, parallel-ground washers, and 12-point nuts

Fits 2005-Up Ford models equipped with the 2.5L B5254 5-cylinder engine (2.5L).

The ARP 251-5801 Main Stud Kit provides the superior clamping force necessary to secure your engine's bottom end under high-performance conditions. Unlike factory bolts that twist during the tightening process, these studs allow for more accurate torque loading by pulling the threads rather than twisting them. This design helps prevent main cap walk and protects the threads in your engine block from premature wear.

• Manufacturer Part Number: 251-5801
• Application: Ford 2.5L B5254 5-Cylinder engine
• Components: High-strength main studs, 12-point nuts, and parallel-ground washers
• Installation: Replaces factory main cap bolts for increased bottom-end stability

Strengthen the bottom end of your engine with the ARP BMC A Series Main Stud Kit (206-5401). These high-strength fasteners are essential for high-performance builds, providing superior clamping force compared to standard OE bolts to prevent main cap walk and protect your crankshaft bearings under high-RPM or high-load conditions.

Precision-machined to exacting tolerances, these studs ensure consistent torque loading and easier engine assembly. By using a stud instead of a bolt, you achieve more accurate preload on the main caps, which is critical for maintaining proper alignment and block integrity in the BMC A-Series engine.

• Designed specifically for BMC A-Series engine applications
• Replaces factory main cap bolts for increased block rigidity
• Minimizes main cap movement and vibration
• Manufactured from premium high-tensile strength alloys
• Includes high-strength studs, parallel-ground washers, and 12-point nuts
• Manufacturer Part Number: 206-5401

Fits Honda L15 4-cylinder engines (1.5L).

The ARP 108-5401 Main Stud Kit provides the critical clamping force required to secure the main caps in high-performance or forced-induction Honda L15 builds. Replacing the factory main bolts with high-strength studs helps prevent main cap walk and ensures the crankshaft remains properly aligned under extreme loads and high-RPM operation.

• Specifically engineered for the Honda L15 1.5L engine platform
• Significantly higher tensile strength compared to OE main bolts
• Precision-rolled threads for maximum fatigue life and consistent torque readings
• Designed to eliminate main cap movement and fretting
• Manufacturer Part Number: 108-5401

Each kit comes complete with precision-machined main studs, hardened parallel-ground washers, and high-strength nuts to ensure a professional-grade installation for your bottom end.

Fits Suzuki GSX1300 Hayabusa models with 2-bolt cases.

The ARP 271-5401 Case Main Stud Kit provides the superior clamping force and reliability necessary for high-performance Suzuki Hayabusa engine builds. Unlike standard factory bolts, these studs ensure precise alignment of the case halves and main bearings, effectively eliminating case walk and movement under high-load or forced-induction conditions.

Constructed from premium 8740 chrome moly steel, these fasteners are heat-treated to a 200,000 psi tensile strength and feature threads rolled after heat treatment for significantly improved fatigue life. This kit includes the necessary hardware for a complete installation to protect your rotating assembly from failure due to case flex.

• Manufacturer Part Number: 271-5401
• Application: Suzuki GSX1300 Hayabusa (2-Bolt Case)
• Material: 8740 Chrome Moly Steel
• Tensile Strength: 200,000 psi
• Heat-treated for maximum durability and strength
• Threads rolled after heat treatment for superior fatigue resistance
• Includes high-strength nuts and parallel-ground washers

Fits select 1990-2012 Subaru Forester, Impreza, and Legacy models (EJ20 / EJ25).

The ARP 260-5401 Block Bolt Kit is an essential upgrade for any Subaru EJ-series engine build or refresh. These high-strength fasteners replace the factory case bolts, providing the superior clamping force required to maintain proper block alignment and prevent case walk under high-load or high-boost conditions. Engineered for precision and durability, this kit ensures the structural integrity of the engine's main case halves where OEM hardware may reach its fatigue limit.

• Specifically designed for Subaru EJ20 and EJ25 boxer engine blocks
• Replaces factory main case bolts for increased reliability and strength
• Critical for high-performance builds and forced induction applications
• Ensures consistent clamping force across the engine case
• Manufacturer Part Number: 260-5401

Fits Subaru FA20 (2.0L) engines.

Ensure the structural integrity of your bottom end with the ARP Main Bolt Kit (260-5001). Designed specifically for the Subaru 2.0L FA20 engine, these high-strength fasteners provide the superior clamping force necessary to secure the main bearing caps and prevent main cap walk under high-stress conditions.

Whether you are performing a routine rebuild or preparing a high-performance engine, ARP hardware offers a significant upgrade over factory stretch-bolts. These fasteners are precision-machined for exact tolerances, ensuring consistent torque loading and improved fatigue life for the engine block assembly.

• Manufacturer Part Number: 260-5001
• Fits Engine: Subaru FA20 (2.0L)
• Engineered for maximum clamping force and reliability
• Direct replacement for OE main bolts
• Ideal for high-RPM and high-boost applications

Fits Ford Modular 6.2L iron block engines.

The ARP 256-5802 4-bolt main stud kit is engineered to provide the superior clamping force required for high-performance Ford 6.2L iron block applications. By replacing factory main bolts with high-strength studs, this kit significantly improves crankshaft alignment and helps prevent main cap walk under high combustion pressures, ensuring your bottom end remains stable during aggressive use.

• Specifically designed for Ford Modular 6.2L iron blocks
• 4-bolt main configuration for maximum structural integrity
• Includes all necessary studs, parallel-ground washers, and nuts
• Provides more accurate torque loading than standard bolts
• Manufacturer Part Number: 256-5802

Strengthen the bottom end of your Ford Modular engine with the ARP 256-5701 Main Stud Kit. Designed specifically for blocks featuring 4-bolt main caps and utilizing a windage tray, these studs provide significantly more accurate and consistent clamping force than factory head bolts. By using studs instead of bolts, you protect the threads in your engine block and ensure proper main cap alignment, which is critical for high-RPM and high-horsepower applications.

Each fastener is manufactured from premium 8740 chromoly steel and heat-treated to a 200,000 psi tensile strength. ARP precision-machines these components to exacting tolerances, including thread rolling after heat treat to ensure maximum fatigue strength and integrity. This kit comes complete with hardened parallel-ground washers and high-strength nuts to facilitate a professional-grade engine assembly.

• Fits Ford Modular engines with 4-bolt main caps and windage tray provisions
• Material: 8740 Chromoly Steel
• Tensile Strength: 200,000 psi
• Finish: Black Oxide
• Includes all necessary studs, washers, and nuts
• Manufacturer Part Number: 256-5701

Secure your engine's bottom end with the ARP Main Bolt Kit for Ford 1.6L EcoBoost 4-cylinder engines. This kit provides the critical clamping force necessary to keep the crankshaft main caps perfectly aligned under high-performance conditions, preventing cap walk and protecting your main bearings from premature wear.

Crafted from premium 8740 chrome moly steel, these fasteners are heat-treated to 200,000 psi tensile strength. Unlike factory torque-to-yield (TTY) bolts that must be discarded after a single use, ARP main bolts are reusable and offer superior fatigue life, making them an essential upgrade for any 1.6L EcoBoost build involving increased boost or higher rev limits.

• Fits Ford 1.6L EcoBoost engines (1.6L)
• Precision-machined threads for consistent torque loading
• Material: 8740 Chrome Moly Steel with Black Oxide finish
• Includes all required main bolts and ARP Ultra-Torque assembly lubricant
• Manufacturer Part Number: 251-5002

Fits 1993-2002 Ford 7.3L Power Stroke diesel engines (7.3L).

The ARP 250-5801 Main Stud Kit provides the clamping force necessary to prevent main cap walk and protect your engine's rotating assembly. This is a critical upgrade for high-mileage overhauls and performance builds alike, replacing the factory main bolts with high-strength studs that ensure a more accurate torque load on the main bearings during assembly.

Each stud is manufactured from premium 8740 chromoly steel, heat-treated to 200,000 psi tensile strength, and precision thread-rolled after heat treatment for maximum fatigue resistance. This process results in a fastener significantly stronger than OE bolts, capable of handling the increased cylinder pressures found in tuned diesel applications.

• Manufacturer Part Number: 250-5801
• Material: 8740 Chromoly Steel
• Tensile Strength: 200,000 psi
• Finish: Black Oxide
• Included Hardware: High-strength main studs, parallel-ground washers, and nuts

Fits Chrysler Hemi engines (5.7L / 6.1L).

Ensuring the bottom end of your engine remains stable under high-load conditions is critical for performance and longevity. The ARP 244-5400 Main Stud Kit provides the superior clamping force needed to prevent main cap walk and protect your crankshaft bearings. Unlike factory bolts that twist during torqueing, these studs remain stationary as the nuts are tightened, resulting in more accurate and consistent preload across the main caps.

• Manufactured from 8740 chromoly steel for extreme durability
• Heat-treated to a tensile strength of 200,000 psi
• Precision centerless ground for perfectly concentric fitment
• Thread-rolled after heat-treat for significantly higher fatigue strength than cut threads
• Black oxide finish for corrosion resistance
• Includes premium 12-point nuts and hardened parallel-ground washers
• Manufacturer Part Number: 244-5400

Secure your engine's bottom end with the ARP Main Stud Kit for Small Block Chevy LT1 (6.2L) engines. Designed to replace factory main bolts, this kit provides the superior clamping force and structural integrity required for high-performance builds. Utilizing studs instead of bolts allows for more accurate and consistent torque loading while protecting the threads in your engine block from excessive wear during assembly and disassembly.

• Fits Small Block Chevy LT1 engines (6.2L)
• Manufacturer Part Number: 234-5802
• Provides increased clamping force to prevent main cap walk and crankshaft movement
• Studs facilitate easier main cap alignment and assembly
• Precision machined from high-strength fastener alloy
• Includes all necessary studs, nuts, and hardened parallel-ground washers

Fits 1997-2004 Chevrolet Camaro, Corvette, Pontiac Firebird, and GTO equipped with LS Gen III or GMPP LSX blocks.

Secure your engine's bottom end with the ARP 234-5608 Main Stud Kit. These studs are a critical upgrade for any high-performance build, providing significantly more clamping force and consistency than factory main bolts. By using studs rather than bolts, you ensure the main caps are perfectly aligned and reduce the risk of thread wear in the engine block during assembly. This kit is essential for preventing main cap walk and maintaining crankshaft alignment under high RPM and heavy loads.

• Manufactured from premium 8740 chrome moly steel
• Heat-treated to 200,000 psi tensile strength for maximum reliability
• Threads are rolled after heat treatment for superior fatigue strength
• Kit includes all necessary main studs, washers, and 12-point nuts
• Engineered for LS Gen III and GMPP LSX blocks
• Manufacturer Part Number: 234-5608

Fits 2006-2010 Chevrolet and GMC 2500HD and 3500HD trucks equipped with the 6.6L Duramax Diesel (LBZ and LMM engine codes).

The ARP 230-5402 Main Stud Kit is a critical upgrade for high-horsepower builds and heavy-duty towing applications. These studs provide the superior clamping force required to eliminate main cap walk and maintain crank alignment under extreme cylinder pressures. Unlike factory bolts that twist during the torque sequence, these studs allow for more accurate and consistent loading of the main caps by isolating the fastener to the vertical axis.

• Manufactured from premium 8740 chrome moly steel.
• Heat-treated to 200,000 psi tensile strength for maximum reliability.
• Centerless ground to ensure perfectly concentric studs.
• Threads are rolled after heat treatment for 10x better fatigue strength than studs with cut threads.
• Black oxide finish for long-lasting corrosion resistance.
• Includes high-strength 12-point nuts and parallel-ground hardened washers.
• Comes with ARP Ultra-Torque fastener assembly lubricant to ensure accurate torque preload.
• Manufacturer Part Number: 230-5402

Fits 2010-2013 Hyundai Genesis Coupe (2.0T).

The ARP 228-5401 Main Stud Kit is a critical upgrade for high-performance 2.0T builds, providing the clamping force necessary to prevent main cap walk and maintain precise crankshaft alignment. Unlike factory bolts that stretch, these 8740 chrome moly studs ensure a consistent load across the entire main journal, protecting your bottom end under high boost and high-RPM conditions.

• Manufacturer Part Number: 228-5401
• Material: 8740 Chrome Moly Steel
• Tensile Strength: 200,000 psi
• Construction: Threads rolled after heat-treat for superior fatigue resistance
• Finish: Black Oxide for corrosion protection
• Included: Main studs, parallel-ground washers, and 12-point nuts

Fits 2000-UP Volvo models equipped with the B5254 5-cylinder engine (2.5L).

The ARP 219-5801 Main Stud Kit is an essential upgrade for any high-performance Volvo engine build. Designed to replace factory main bolts, these studs provide superior clamping force to ensure the main caps remain securely seated under high RPM and heavy boost conditions. By reducing main cap walk and block distortion, this kit protects your rotating assembly and extends the life of your main bearings.

• Specifically engineered for Volvo B5254 5-cylinder blocks
• Ensures consistent and accurate torque loading for bottom-end stability
• Premium quality fasteners manufactured to ARP’s exacting tolerances
• Complete kit includes main studs, 12-point nuts, and parallel-ground washers
• Manufacturer Part Number: 219-5801

Fits 2003-2007 Mazda 3, 5, and 6 models equipped with the 2.3L DOHC 16V engine.

Engineered for high-stress applications, this ARP Main Stud Kit provides the superior clamping force required to secure the crankshaft main caps to the block. Unlike factory bolts that stretch, these studs ensure consistent loading and prevent main cap walk, protecting your engine's bottom end during high-RPM operation or increased power levels. The stud design also eases engine assembly by accurately positioning the main caps and protecting the block threads from excessive wear.

• Prevents main cap walk and crankshaft misalignment
• Provides higher tensile strength than factory hardware
• Protects engine block threads during repeated assembly
• Includes all necessary studs, washers, and nuts
• Manufacturer Part Number: 218-5402
• Engine Application: Mazda 2.3L DOHC 16V

Fits 1990-2005 Mazda Miata models including Base, Mazdaspeed, LS, SE, and special editions.

The ARP Main Stud Kit (218-5401) is a critical upgrade for any Mazda B-series engine build, providing the consistent clamping force necessary to secure the crankshaft main caps. Unlike factory main bolts that twist during installation, these studs remain stationary while the nut is torqued, resulting in more accurate loading and protecting the threads in your engine block from excessive wear.

Whether you are performing a stock rebuild or preparing a high-boost turbocharged application, these studs offer superior fatigue strength and reliability over OE hardware. Each kit is precision-engineered to handle the increased internal pressures of high-RPM operation.

• Manufactured by ARP for exact tolerances and maximum strength
• Provides more consistent clamping force than factory main bolts
• Simplifies engine assembly and protects block threads
• Includes all necessary studs, parallel-ground washers, and nuts
• Manufacturer Part Number: 218-5401

Fits Vauxhall and Opel 2.0L 16V engines (2.0L).

The ARP 209-5401 Main Stud Kit provides the superior clamping force and precise alignment required for high-performance Vauxhall and Opel engine builds. While standard OE main bolts are prone to stretching and can allow main cap walk under high RPM or forced induction, these ARP studs ensure the bottom end remains stable. This kit protects the crankshaft and bearings by maintaining consistent torque loads and preventing cap movement or block distortion.

• Manufactured from premium 8740 chromoly steel for maximum durability
• Heat-treated to a 200,000 psi tensile strength rating
• J-form threads rolled after heat treatment for increased fatigue resistance
• Ensures repeatable and accurate main cap alignment during assembly
• Complete kit includes heavy-duty studs, parallel-ground washers, and 12-point nuts
• Manufacturer Part Number: 209-5401

Fits 1990-2001 Acura Integra GS, LS, RS, and Special Edition (B18A1 / B18B1 engines).

The ARP 208-5404 Main Stud Kit is a critical upgrade for securing the bottom end of your Acura B-series non-VTEC engine. Factory main bolts are prone to stretching under high-load conditions, which can lead to main cap walk and improper crankshaft alignment. By replacing the OE hardware with these high-strength studs, you ensure consistent clamping force and superior structural integrity for the main bearing caps.

Each stud is manufactured from 8740 chrome moly steel and heat-treated to a 200,000 psi tensile strength. To ensure maximum fatigue life and accuracy, the threads are rolled after the heat-treating process rather than cut. The kit includes all necessary hardware to stabilize the rotating assembly in high-RPM or forced-induction applications.

• Manufacturer Part Number: 208-5404
• Material: 8740 Chrome Moly steel
• Tensile Strength: 200,000 psi
• Design: Precision centerless ground for perfect concentricity
• Thread Type: Rolled after heat treatment for maximum strength
• Includes: Full set of main studs, parallel-ground washers, and high-strength nuts

Fits 1994-2001 Acura Integra GS-R and Type R models. The ARP 208-5403 Main Stud Kit provides the essential clamping force required to secure the engine bottom end in high-performance applications. By replacing the factory main bolts with high-strength studs, this kit significantly reduces main cap walk and protects your crankshaft bearings during high-RPM operation or increased boost levels.

• Manufacturer Part Number: 208-5403
• Optimizes main cap alignment and eliminates cap movement
• Designed specifically for the B18C1 and B18C5 engine blocks
• Includes heavy-duty studs, parallel-ground washers, and high-strength nuts
• Required for performance builds and high-stress racing environments

Fits 1994-2000 Honda Civic Si and Civic del Sol VTEC (B16A).

The ARP 208-5402 Main Stud Kit is an essential upgrade for any B16A engine build, providing significantly more clamping force than factory main bolts. These studs ensure the crankshaft main caps remain properly seated, preventing main cap walk and maintaining critical bearing clearances during high-RPM operation or under the increased loads of forced induction.

• Manufacturer Part Number: 208-5402
• Application: Honda B16A VTEC engines
• Kit Components: Includes high-strength main studs, parallel-ground washers, and 12-point nuts
• Design: Provides superior torque loading and protects engine block threads compared to OEM bolts

Fits Honda H22A4 VTEC engines.

Protect your engine's bottom end and ensure precise alignment with the ARP 208-5401 Main Stud Kit. Designed to replace factory main bolts, these high-strength studs provide a much more accurate and consistent torque load to the main caps. By using studs instead of bolts, you eliminate the friction and wear on the block's internal threads, which is critical for aluminum blocks during assembly and future teardowns.

These studs are essential for high-performance builds to prevent main cap walk under extreme cylinder pressures. Each kit is manufactured to exacting tolerances to ensure a perfect fit and long-term durability under racing or high-boost conditions.

• Prevents main cap walk and ensures proper crankshaft alignment
• Protects engine block threads from wear during assembly
• Heat-treated for maximum tensile strength and fatigue life
• Includes all necessary studs, nuts, and hardened parallel-ground washers
• Manufacturer Part Number: 208-5401

Fits select 1992-2005 Mitsubishi 3000GT, Diamante, Eclipse, and Dodge Stealth (3.0L).

Essential for high-performance builds or engine refreshes, the ARP 207-5801 Main Stud Kit replaces factory main bolts to provide superior clamping force and bottom-end stability. In the 6G72 3.0L engine, using studs instead of bolts allows for more accurate and consistent torque loading of the main caps. This prevents cap walk and reduces wear on the block's internal threads, as the studs remain stationary during the assembly process.

Each kit is manufactured to exacting tolerances to ensure a perfect fit and reliable performance under high-stress conditions. The studs facilitate easier engine assembly by accurately aligning the main caps every time.

• Manufacturer Part Number: 207-5801
• Application: Mitsubishi 6G72 3.0L 6-Cylinder engines
• Construction: High-strength hardware engineered for precision torque
• Kit includes: Complete set of main studs, parallel-ground washers, and nuts
• Fitment: Replaces OE main cap hardware for improved crankshaft securement

Fits 2008-2014 Mitsubishi Lancer Evolution (GSR, MR, MR Touring) and Lancer Ralliart (2.0L 4B11T).

The ARP Main Stud Kit (MPN: 207-5403) is a critical upgrade for high-performance 4B11T engine builds. Designed to provide significantly higher clamping force than factory main bolts, these studs eliminate main cap walk and protect against crankshaft misalignment during high-boost or high-RPM operation. By replacing the standard OEM hardware, you ensure the structural integrity of the bottom end under extreme cylinder pressures.

• Specifically engineered for the Mitsubishi 2.0L Turbo 4B11T engine
• Premium high-strength construction for maximum durability
• Precise threading for consistent torque loading
• Includes all necessary studs, parallel-ground washers, and nuts
• Manufacturer Part Number: 207-5403

Fits select 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Eagle Talon, and Plymouth Laser models.

Protect your engine's bottom end with the ARP 207-5401 Main Stud Kit. Engineered to provide superior clamping force compared to factory hardware, these studs prevent main cap walk and fretting, which is critical for high-performance builds and turbocharged applications. By using studs instead of bolts, you ensure more accurate torque loading and protect the threads in your engine block from premature wear during assembly.

• Manufacturer Part Number: 207-5401
• Includes high-strength main studs, parallel-ground washers, and nuts
• Provides consistent clamping force for the crankshaft main caps
• Essential for high-RPM and forced induction reliability

Vehicle Fitment:

• 1990-1998 Eagle Talon TSi
• 1990-1994 Mitsubishi Eclipse GS
• 1990-1999 Mitsubishi Eclipse GST / GSX
• 1996-1999 Mitsubishi Eclipse Spyder GST
• 2003-2006 Mitsubishi Lancer Evolution (Base, MR, RS, SE)
• 1990-1994 Plymouth Laser RS

Fits 2008-2014 Mitsubishi Lancer Evolution GSR, MR, and MR Touring (2.0L).

The ARP 207-5201 Main Bolt Kit is an essential upgrade for the Mitsubishi 4B11 engine, providing the clamping force necessary to secure the main caps during high-performance operation. Designed specifically for 4-bolt turbo applications, these fasteners replace the factory hardware to ensure the crankshaft remains properly aligned under the extreme stresses of increased boost and high RPM.

• Specifically engineered for the Mitsubishi 2.0L (4B11) 4-bolt turbo block
• Maintains precise main cap alignment and prevents cap walk
• Manufacturer Part Number: 207-5201
• Direct replacement for OE main cap bolts
• Ideal for high-horsepower street and track builds

Fits select 2000-2005 Audi S4, A6 Quattro, and Allroad Quattro (2.7L).

The ARP Main Stud Kit (204-5801) provides the superior clamping force and consistency required for high-performance 2.7L Bi-Turbo V6 builds. Unlike factory main bolts that stretch during installation, these studs are designed to ensure precise main cap alignment and prevent cap walk under extreme loads. This kit is a foundational upgrade for any enthusiast looking to improve the structural integrity of their Audi bottom end.

• Manufacturer Part Number: 204-5801
• Engine Fitment: 2.7L Bi-Turbo V6
• Hardware Included: Full set of main studs, parallel-ground washers, and 12-point nuts
• Installation Benefit: Replaces OE main bolts to provide more accurate torque loading and protect engine block threads