Strengthen the foundation of your engine with the Top Street Performance Pro Series Chevy Small Block 4-Bolt Large Journal Main Stud Kit. Designed for Chevrolet Gen I Small Block engines equipped with 4-bolt main caps and large journal crankshafts, this SBC main stud kit provides the strength and clamping force needed to help maintain secure main bearing cap retention in street, performance, marine, and racing applications. Whether you're rebuilding a 327 large journal, 350, or 400 Small Block Chevy, these Small Block Chevy main studs deliver dependable bottom-end fastening performance.

Improved Main Bearing Cap Retention
Designed to replace factory main bolts, these SBC main cap studs provide consistent clamping force and secure main cap retention. Stud-style fasteners help improve fastener engagement and are commonly used in performance engine builds, rotating assembly upgrades, and demanding racing applications.

High-Strength Performance Construction
Manufactured from heat-treated 35 chromoly steel with a minimum tensile strength of 190,000 PSI, this Small Block Chevy main stud kit is built to withstand demanding engine conditions. Threads are rolled after heat treatment, tested for tensile and yield strength, and protected with a black oxide finish and oil coating for enhanced durability and corrosion resistance.

Designed for 4-Bolt Large Journal SBC Engines
Engine-specific design provides compatibility with Chevrolet Gen I Small Block engines utilizing 4-bolt main caps and large journal crankshaft configurations. These SBC main bearing cap studs are ideal for stock replacement, engine rebuilds, marine applications, and performance engine builds.

Ideal for Rebuilds & Performance Builds
Perfect for engine assembly, rotating assembly service, bottom-end rebuilds, stroker builds, and performance engine projects where upgraded Small Block Chevy bottom-end hardware is recommended. An excellent choice for maintaining secure main cap retention in demanding street, marine, and racing environments.

COMPATIBLE WITH
CHEVROLET SMALL BLOCK V8 GEN I (4-BOLT LARGE JOURNAL)
• 5.4L / 327 in³ (1968-Up Large Journal Applications)
• 5.7L / 350 in³
• 6.6L / 400 in³

COMMON USES
• Small Block Chevy Engine Rebuilds
• Bottom-End Refreshes
• Main Bearing Service
• Rotating Assembly Rebuilds
• Street Performance Builds
• Marine Engine Builds
• Engine Assembly Projects

NOTES
• Designed for Gen I Small Block Chevy engines with 4-bolt main caps.
• Designed for large journal Gen I Small Block Chevy applications.
• Verify block and crankshaft configuration before ordering.
• Not compatible with small journal SBC engines.
• Not compatible with LS, LT, or Big Block Chevy engines.

SPECIFICATIONS
Torque: 3 steps up to 75ft-lbs / inner 75ft-lbs /outer step 1 25ft-lbs / step 2 50ft-lbs / step 3 75ft-lbs
Color: Black
Fastener Style: Stud
Grade: Performance
Head Style: Hex
Material: 35 Chromoly Steel
Quantity: Sold as a kit