Strengthen the foundation of your engine with the Top Street Performance Pro Series Chevy Big Block 2-Bolt Main Bolt Kit. Designed for Chevrolet Big Block Mark IV engines equipped with 2-bolt main caps, this BBC main bolt 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 396, 402, 427, or 454 Big Block Chevy, these Big Block Chevy main bolts deliver dependable bottom-end fastening performance.

Secure Main Bearing Cap Retention
Designed to securely fasten the main bearing caps to the engine block, these BBC main cap bolts help maintain consistent clamping force and reliable crankshaft support. Ideal for engine rebuilds, rotating assembly service, and performance engine projects requiring dependable main cap fasteners.

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

Designed for 2-Bolt Main Big Block Chevy Engines
Engine-specific design provides compatibility with Chevrolet Big Block Mark IV engines utilizing factory-style 2-bolt main cap configurations. These BBC main bearing cap bolts 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, and performance engine projects where fresh Big 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 BIG BLOCK V8 GEN. II (MARK IV)
• 6.5 L / 396 in³
• 6.6 L / 402 in³
• 7.0 L / 427 in³
• 7.4 L / 454 in³

COMMON VEHICLE APPLICATIONS
• Chevrolet big block V8 street and performance engines
• Chevelle, Camaro, Corvette, and C/K truck big block Chevy builds
• Hot rod and muscle car big block Chevy engine installations

NOTES
• Designed for factory-style 2-bolt main cap Big Block Chevy applications.
• Verify block configuration before ordering.
• Not compatible with 4-bolt main BBC blocks.
• Not compatible with Small Block Chevy, LS, or LT engines.

SPECIFICATIONS
Torque: 4 steps up to 100ft-lbs / step1 25ft-lbs / step 2 50ft-lbs / step 3 75ft-lbs / step 4 100ft-lbs
Color: Black
Fastener Style: Bolt
Grade: Performance
Head Style: Hex
Material: 35 Chromoly Steel
Quantity: Sold as a kit