Pro Series Chevy Big Block 2-Bolt Main Bolt Kit

• Fits BBC 2-Bolt Main Engines: Designed for Chevrolet Big Block Mark IV 2-bolt main applications.

• 190,000 PSI Tensile Strength: Heat-treated 35 chromoly steel construction.

• Hex Head Main Bolts: Provides secure installation and straightforward serviceability.

• Ideal for Rebuilds & Performance Builds: Perfect for bottom-end service and engine assembly projects.

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.

What does this main bolt kit fit?
This kit is designed for Chevrolet Big Block Mark IV engines equipped with factory-style 2-bolt main caps, including many 396, 402, 427, and 454 applications.

What is a main bolt kit?
A main bolt kit provides the fasteners used to secure the crankshaft main bearing caps to the engine block.

Why replace main bolts during a rebuild?
Replacing main cap hardware during an engine rebuild helps ensure proper clamping force and reliable main bearing cap retention.

Is this kit suitable for performance applications?
Yes. The heat-treated 35 chromoly steel construction and 190,000 PSI tensile strength make this kit suitable for street performance, marine, and racing applications.

What material are the bolts made from?
The hardware is manufactured from premium 35 chromoly steel and features rolled threads, a black oxide finish, and protective oil coating for durability and corrosion resistance.

What is the difference between a 2-bolt and 4-bolt main block?
A 2-bolt main block uses two fasteners per main bearing cap, while a 4-bolt main block uses four fasteners per cap for additional retention under high-performance conditions.

Can these be used in racing applications?
Yes. This BBC main bolt kit is suitable for performance street, marine, and racing engine builds requiring dependable main cap fasteners.

Do these fit all Big Block Chevy engines?
No. This kit is specifically designed for compatible 2-bolt main Big Block Chevy Mark IV applications. Verify your block configuration before ordering.