Automotive fastening part that helps secure the harmonic balancer and enable precise engine rotation. The big-autoparts Harmonic Balancer Bolt combines a high hex head, an extra-thick parallel ground washer and split lock washers for confident fitment and reduced loosening. Is this the right choice for small-block Chevy owners who need race-ready hardware?
⚡ At a Glance
- • Fastening Security: High-hex head with split lock washers resists socket slippage and vibration loosening
- • Best for: Owners of small block Chevy engines needing reliable, performance-oriented bolts
- • Not ideal for: Vehicles outside the specified Chevy small-block family or where OE-specific fasteners are required
Designed specifically for small block Chevy applications, combining a high hex head, extra-thick parallel ground washer and split lock washers. Built to improve torque accuracy and resist loosening under vibration.
Secure Engine Rotation – thanks to high hex head
High hex head increases the contact area between socket and bolt, reducing the chance of cam or valve timing tools slipping during rotation. The geometry allows safer rotation when setting engine degree or adjusting valves.
More confident engine turning during setup and timing checks, with reduced risk of rounding the head or losing grip while working.
More Uniform Torque – with extra-thick parallel ground washer
Extra-thick parallel ground washer provides a flatter, more consistent bearing surface so torque loads distribute evenly across the mating face. Parallel grinding reduces stress concentrations that cause uneven preload.
Tighter, more repeatable torque readings when tightening, leading to a more reliable clamping force and fewer retorques.
Vibration-Resistant Fastening – thanks to split lock washers
Split lock washers bite into mating surfaces and exert spring tension that resists rotational loosening from engine vibration. The included washers are matched to the bolt for immediate use.
Reduced chance of fastener loosening in drag race or circle track environments, helping maintain harmonic balancer security during high-vibration use.
✨ The 4 Key Reasons for big-autoparts Harmonic Balancer Bolt
- High-hex head - Reduces socket slippage when rotating the engine or adjusting valves
- Extra-thick parallel ground washer - Ensures more uniform torque distribution across the flange
- Split lock washers included - Helps prevent loosening caused by sustained vibration
- Designed for small block Chevy - Suited to performance and track applications like drag racing and circle track
📋 Technical Details at a Glance
- Category: Automotive Parts and Accessories
- Designed for: Small block Chevy (280, 305, 350, 383)
- Head type: High hex head
- Washer type: Extra-thick parallel ground washer
- Locking mechanism: Split lock washers included
❓ Frequently Asked Questions
Q: Is this bolt compatible with small block Chevy engines listed in the name?
A: Yes. Designed specifically for small block Chevy applications including 280, 305, 350 and 383 engines.
Q: Does the package include anything to prevent loosening from vibration?
A: Yes. Comes complete with split lock washers to help prevent loosening caused by vibration.
Q: Is the head shape suitable for rotating the engine during valve adjustments?
A: Yes. High hex head prevents socket slippage when adjusting valves or rotating the engine to degree in a cam.
🏆 Our Verdict
Suited to small-block Chevy owners and racers who need confident harmonic balancer fastening under high-vibration conditions. The combination of a high-hex head, extra-thick parallel ground washer and split lock washers focuses on accurate torque and reduced loosening. While buyers should consider suitability for their specific engine setup, the hardware aims to deliver reliable long-term fastening for performance use.
