- Exhaust pipe produces white smoke
The cylinder head has coolant tubes that go through it. A breach in the head can allow coolant from those tubes to seep into the combustion chamber of the cylinder head, where it is subsequently consumed during the combustion process. As a result, white smoke, which is steam, can be seen emitting from the vehicle’s tailpipe.
In a damaged cylinder head, the crack in the cylinder head enables the coolant to penetrate (and burn) within the combustion chamber, the coolant level may begin to decline.
- Cylinder head overheating
When a cylinder head cracks, coolant can leak into the combustion chamber instead of flowing properly through the cylinder head. The cylinder head may begin to overheat as a result.
- Warning lights may illuminate
The check cylinder head light, low coolant level light, and cylinder head overhead light may all glow if a cylinder head is damaged. You may see your vehicle’s temperature indicator also starting to increase.
- Rough running and misfiring of the cylinder head
A cylinder head requires three components for complete combustion: the right spark, the right air/fuel ratio, and the right compression. Compression loss from a damaged cylinder head might cause the cylinder head to run rough and misfire.
- Combustion gases in the cooling system
The entry of combustion gases into the cooling system can be facilitated by a broken cylinder head. As a consequence, you may observe a lot of bubbles in the coolant before it starts to boil. You may also notice that the cooling system is under a lot of strain.
You Get the Exact Same Part the Engine Was Built With
Used OEM cylinder heads are not aftermarket imitations. They were manufactured by General Motors to the same specifications as what originally came on your Impala. That means the same casting, the same port geometry, the same valve seat angles, and the same tolerances your engine was designed around. Some aftermarket cylinder heads introduce subtle variations in port flow or material composition that can affect long-term performance. A used OEM head sidesteps that risk entirely. Your engine gets back what it lost, nothing more and nothing less.
The Savings Are Significant and Real
When a shop orders a new cylinder head and installs it, you are paying their markup on the part, plus labor, plus associated components like gaskets, coolant, and head bolts. That adds up fast. Many BackToRoad customers bring their total repair cost down by 60 to 70 percent by sourcing a tested used head rather than letting a dealership supply a new one. That is a real dollar difference worth hundreds, sometimes over a thousand dollars, depending on your year and engine.
Older Impalas Are Actually Easier to Fix This Way
If you own a 2001 or 2004 Impala with the 3.4L V6, finding a brand-new replacement cylinder head can be surprisingly difficult and expensive. Manufacturers do not prioritize tooling and inventory for older vehicles. The used parts market, on the other hand, still has a healthy supply of heads from these years, pulled from low-mileage donor vehicles. With BackToRoad Auto Parts’s extensive connections to salvage yards across the country, we can source parts for a wide range of Impala years and engine codes that your local auto parts store simply will not stock
Reliability You Can Count On
Every cylinder head we sell is inspected before it ships, and all parts carry our standard 30-day warranty. Buying a used engine part does not mean crossing your fingers. It means buying a part that has already proven itself in a running vehicle, from a seller who stands behind what they send you.
It Is Also the Greener Choice
Salvaged OEM parts extend the life of materials that have already been mined, refined, and machined. Choosing a used cylinder head keeps usable metal out of a landfill and skips the energy cost of manufacturing a brand-new casting. For Impala owners who care about their environmental footprint, this is a meaningful choice, not just a convenient rationalization.
Guide For Buying Used Chevy Impala Cylinder Heads
Buying a used cylinder head takes a bit more care than picking up a filter or a belt. Here is what we recommend to every Impala owner who calls us, whether they end up ordering from us or not.
Start With Your VIN, Not Just Your Year
Two 2008 Chevy Impalas sitting in the same parking lot can have different engines and therefore need different cylinder heads. Your VIN tells you exactly which engine came installed at the factory. The 8th digit of your VIN is your engine code. Before calling us or placing any order, have your full 17-digit VIN on hand. This single step eliminates the most common ordering mistake we see.
Know Whether You Need the Left Side, the Right Side, or Both
V6 engines have two cylinder heads: one for each bank of cylinders. They look similar but are two distinct parts. If your overheating issue or oil contamination was isolated to one side, you may only need one head replaced. If the engine overheated severely, a mechanic will likely want to inspect both heads before deciding. Ordering the wrong side is one of the most avoidable mistakes in this repair process. When in doubt, confirm with your mechanic before ordering.
Check the Casting Number on Your Old Head
If the old head is coming off, have your mechanic write down the casting number stamped directly on the head surface. This number is your most reliable matching tool. For example, GM part number 12633959 is the right-hand cylinder head for many 2012 to 2017 3.6L LFX engines, found in the Impala, Camaro, and several other GM models. Knowing your casting number opens up the cross-reference pool, which often means better availability and a lower price.
Ask Whether the Head Has Been Crack-Tested
A cylinder head can look perfectly fine on the outside and still have a hairline crack that will cause it to fail within weeks of installation. The standard method for detecting these cracks is magnaflux testing (magnetic particle inspection) or a pressure test. When you buy from BackToRoad, our parts go through an inspection process before shipping. If you are shopping elsewhere, always ask whether crack testing was done. If the seller cannot answer that question confidently, factor the risk into your decision.
Budget for a Fresh Gasket, New Head Bolts, and a Flatness Check
A used cylinder head going onto your engine should always be paired with a new head gasket. This is not optional. Most experienced mechanics also recommend having the mating surface checked by a machine shop for flatness, particularly if the original failure involved overheating, which can warp the head enough to prevent a proper seal even on a structurally sound part. Machine shop rates for a surface check are modest, and it is the difference between a repair that lasts years and one that fails in months.
Also keep in mind that many modern Impala engines use torque-to-yield (TTY) head bolts, meaning the bolts are engineered for single use and must be replaced any time the head comes off. Reusing old TTY bolts is a false economy that can lead to a failed seal down the road.
Confirm the Warranty Terms Before You Commit
At BackToRoad, all cylinder heads are covered by our standard 30-day warranty. If you’re shopping elsewhere, always ask about return and warranty policy before purchasing. A used engine part sold with no return window or no warranty is a risk that usually is not worth taking on a job this significant.
Are you looking to buy a used Chevy Impala cylinder head?
We’ve got you covered–check our inventory here to get the used Chevy Impala cylinder head you need. You can place an order here on our website and our Auto Parts Specialist will get back to you or you can talk to our Auto Parts Team at 1-800-608-3868 to place your order.
Place your order now and get your car BackToRoad.
