Pro Series Chevy Big Block Bowtie / Dart / Merlin / Pro Top / World Products Cylinder Head 12-point Bolt Kit

• Fits Aftermarket BBC Cylinder Heads: Designed for Bowtie, Dart, Merlin, Pro Top, and World Products applications.

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

• 12-Point Head Design: Provides accurate torque readings and improved serviceability.

• Supports Reliable Head Gasket Sealing: Helps maintain consistent cylinder head clamping force.

Upgrade your Big Block Chevy build with the Top Street Performance Pro Series Big Block Chevy Cylinder Head 12-Point Bolt Kit. Designed for Bowtie, Dart, Merlin, Pro Top, and World Products cylinder head applications, this BBC head bolt kit provides the clamping force and durability needed to help maintain reliable head gasket sealing in street, performance, and racing engines. Whether you're assembling a fresh engine, upgrading aftermarket cylinder heads, or completing a rebuild, these Big Block Chevy cylinder head bolts deliver dependable fastening performance.

Reliable Cylinder Head Clamping Force
Designed to securely fasten aftermarket cylinder heads to the engine block, this Big Block Chevy head bolt kit helps maintain consistent cylinder head clamping force and dependable head gasket retention. Ideal for engine rebuilds, cylinder head upgrades, and performance engine assembly projects.

High-Strength Performance Construction
Manufactured from heat-treated 35 chromoly steel with a minimum tensile strength of 190,000 PSI, these BBC head bolts are 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. TSP specifies a four-step torque procedure of 85 ft-lbs on long bolts and 75 ft-lbs on short bolts.

Designed for Aftermarket Big Block Chevy Cylinder Heads
Engine-specific design provides compatibility with Bowtie, Dart, Merlin, Pro Top, and World Products cylinder heads used on Chevrolet Big Block Mark IV engine applications. These performance Big Block Chevy head bolts are ideal for 396, 402, and 454 engine combinations utilizing compatible aftermarket cylinder heads.

Ideal for Rebuilds & Performance Engine Builds
Perfect for cylinder head installation, head gasket replacement, engine assembly, and racing engine projects where fresh cylinder head hardware is recommended. An excellent choice for maintaining proper head gasket sealing and long-term reliability in high-performance Big Block Chevy applications.

What engines does this head bolt kit fit?
This kit is designed for Chevrolet Big Block Mark IV engine applications using Bowtie, Dart, Merlin, Pro Top, or World Products cylinder heads, including many 396, 402, and 454 combinations.

What cylinder heads is this kit designed for?
This kit is intended for Bowtie, Dart, Merlin, Pro Top, and World Products aftermarket Big Block Chevy cylinder heads.

Why replace cylinder head bolts during a rebuild?
Replacing cylinder head hardware helps ensure proper clamping force, reliable head gasket sealing, and long-term durability during engine assembly or cylinder head service.

Are these suitable for performance applications?
Yes. The bolts are manufactured from heat-treated 35 chromoly steel with a minimum tensile strength of 190,000 PSI for demanding street and racing use.

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

What is the benefit of a 12-point head design?
The 12-point head design provides improved socket engagement and helps achieve accurate torque readings during installation.

Can these be used with factory Big Block Chevy heads?
No. This kit is specifically designed for Bowtie, Dart, Merlin, Pro Top, and World Products cylinder head applications. Verify cylinder head compatibility before ordering.

What torque specification should be used?
TSP specifies a four-step torque sequence with long bolts torqued to 85 ft-lbs and short bolts torqued to 75 ft-lbs. Always follow the manufacturer’s installation instructions and torque sequence.