A Guide to the Engine Cylinder Head Bolt Set for 2006-2010 Chevrolet Impalas
If you're replacing the head gasket on your Impala, replacing the head bolts is not optional—here's what you need to know.
- Head bolts on the 2006-2010 Impala are Torque-to-Yield (TTY) and MUST be replaced any time the cylinder heads are removed.
- Head bolt replacement is part of a larger head gasket job, which is often needed due to coolant leaks and overheating on the 3.5L and 3.9L V6 engines.
- Choose high-quality aftermarket brands like Fel-Pro or Victor Reinz for OEM-level reliability.
- Driving with symptoms of a blown head gasket can lead to catastrophic engine damage. Do not drive the vehicle.
Understanding Head Bolt Failure on Your Impala
Head bolts themselves rarely fail on their own. Instead, they are replaced as a necessary part of a head gasket job. The head gasket is the part that typically fails, often due to engine overheating. 🎬 Watch: How to spot the telltale signs of a bad head gasket. The 3.5L and 3.9L V6 engines used in the 2006-2010 Impala can be prone to coolant leaks, which may lead to overheating and subsequent head gasket failure. When the head gasket is replaced, the original head bolts must be discarded and a new set installed.
Why You MUST Replace TTY Bolts
The head bolts in your Impala are Torque-to-Yield (TTY). This means they are tightened to a specific torque and then turned an additional angle, which permanently stretches them. This process ensures maximum, even clamping force. Reusing them is unsafe because they have already been stretched and will not torque correctly a second time. A reused bolt can break or fail to provide enough clamping force, causing the new head gasket to fail almost immediately.
Choosing the Right Aftermarket Head Bolt Set
When shopping for new head bolts, you'll find several aftermarket brands available. For a critical repair like this, choosing a quality brand is essential for a long-lasting repair. OEM bolts from GM are a reliable choice, but quality aftermarket brands offer comparable performance at a better price.
Brand Quality Tiers
- Top Tier (OEM Quality): Brands like Fel-Pro and Victor Reinz are highly respected in the industry. Fel-Pro is a go-to brand for professional mechanics for all sealing components, and their head bolts are known for quality and reliability. Victor Reinz is an original equipment manufacturer (OEM) for many European brands and produces high-quality gaskets and bolts that meet or exceed factory specifications.
- Standard Tier: Brands like Apex offer a more budget-friendly option. They manufacture a wide range of parts that are designed to meet OEM specifications and can be a good choice for drivers on a tighter budget, though they may not have the long-standing reputation of Fel-Pro or Victor Reinz.
Pro Tip: Many head gasket sets include new head bolts. If you are buying a complete head gasket kit from a brand like Fel-Pro or Victor Reinz, it will likely come with the correct, high-quality bolts needed for the job, saving you a separate purchase.
Known Issues and Technical Service Bulletins (TSBs)
General Motors issued a technical service bulletin (TSB 08-06-01-012B) related to coolant leaks on the 3.5L and 3.9L engines. While it primarily addresses gasket issues, it highlights a known problem area. The bulletin notes that if a leak is found at the cylinder head gasket, it must be replaced. It also specifies a change in the bolts used at certain locations, requiring smaller flange bolts and a new style of lower intake manifold gasket to accommodate them. This indicates that using the correct, updated parts during a head gasket repair is critical.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Head Bolt Set | $45 - $78 |
| New OEM Head Bolt Set | $80 - $150 |
| Shop Labor (for complete head gasket job) | $1200 - $2000+ |
Frequently Asked Questions (FAQ)
Can I reuse the old head bolts to save money?
No. The head bolts on the 2006-2010 Impala are Torque-to-Yield (TTY) and are designed for one-time use only. They permanently stretch during installation and cannot provide the correct clamping force if reused, which will lead to the failure of your new head gasket.
Do these aftermarket bolt sets come with washers?
It depends on the brand and the specific kit. High-quality kits like those from Fel-Pro often include hardened washers if the application requires them. Always check the product description to confirm what is included in the set.
Is replacing head bolts a DIY job?
Replacing head bolts is part of a head gasket replacement, which is a very advanced and complex job. It requires specialized tools like a torque wrench and a torque angle gauge, and a deep understanding of engine mechanics. For most car owners, this is a job best left to a professional mechanic.
🎬 See this complete walkthrough of a 3.5L head gasket replacement.Do I need to do anything to the engine block before installing new bolts?
Yes, this is a critical step. The threaded bolt holes in the engine block must be perfectly clean. Use a thread chaser (not a thread tap) to clean out old sealant, rust, and debris. Any fluid or debris left in the holes can prevent the bolts from torquing down correctly and may even crack the engine block.
🎬 Watch: A super important step for cleaning head bolt holes.Helpful Videos
Technical Specifications
OEM Part Numbers: 11518953 11570637
Torque-to-Yield (TTY) design. One-time use only. Set typically includes bolts for one cylinder head, so two sets are required for a V6 engine.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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