Choosing the right head gasket for a 6.0 LS engine is critical for sealing combustion pressure and preventing coolant leaks. In our evaluation, we compared seven popular options based on manufacturer specifications, published industry standards, and aggregated owner feedback. We considered material type, bore size, compressed thickness, and compatibility with boosted or naturally aspirated builds. Below are our findings to help you match a gasket to your specific engine setup.
| Photo | Product | Score | Buy |
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GM Genuine Parts 12601390 Head Gasket Best OEM Replacement MLS, 4.060 in bore, 0.051 in compressed thickness |
9.0 | 🛒 Check Price |
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Fel-Pro 26113PT PermaTorqueMLS Head Gasket Best Aftermarket MLS MLS, 4.060 in bore, 0.051 in compressed thickness, wire ring |
9.2 | 🛒 Check Price |
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Cometic C5501-040 Head Gasket Best for Boosted Builds MLS, 4.060 in bore, 0.040 in compressed thickness, multi-layer |
8.7 | 🛒 Check Price |
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Victor Reinz 58926 Head Gasket Best Budget MLS MLS, 4.060 in bore, 0.051 in compressed thickness |
8.1 | 🛒 Check Price |
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Mahle Original 5495 Head Gasket Best for Aluminum Heads MLS, 4.060 in bore, 0.051 in compressed thickness, aluminum-friendly coating |
8.4 | 🛒 Check Price |
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ARP 134-1001 Head Stud Kit (used with gasket) Best Stud Kit for Gasket Seal Head stud kit, 7/16 in, 12-point nuts, 8740 chromoly |
7.8 | 🛒 Check Price |
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SCE Gaskets ICS Copper Head Gasket Best for Extreme Applications Copper, 0.060 in thickness, O-ring compatible |
7.3 | 🛒 Check Price |
1. GM Genuine Parts 12601390 Head Gasket: Best OEM Replacement
The GM Genuine Parts 12601390 is the standard MLS gasket used on factory 6.0 LS engines. In our research, owner feedback consistently reports no leaks when installed on stock or mildly modified engines. The Viton coating helps resist coolant and oil degradation over time. We found the compressed thickness of 0.051 inches maintains proper quench height for most stock pistons.
However, for forced induction or nitrous applications exceeding 15 psi, this gasket may not provide enough clamping force. Some owners have reported failures under high boost. Skip this if you are building a high-horsepower turbo or supercharged engine. It is best for daily drivers and mild performance upgrades.
- Factory-spec multilayer steel (MLS) design for reliable sealing
- Pre-coated with Viton for enhanced fluid resistance
- Direct fit for most 6.0 LS engines including LQ4 and LQ9
Pros: Proven OEM quality and fitment; Excellent long-term durability in stock applications
Cons: Not ideal for high-boost builds over 15 psi
2. Fel-Pro 26113PT PermaTorqueMLS Head Gasket: Best Aftermarket MLS
Fel-Pro’s 26113PT is a premium aftermarket MLS gasket designed for high-performance LS engines. In our evaluation of spec sheets, the wire ring around the cylinder bore provides a superior combustion seal, making it suitable for forced induction up to 20 psi. Owner feedback on forums indicates this gasket holds well in 600+ horsepower builds. The pre-applied coating simplifies installation.
That said, the higher cost may not be justified for a stock rebuild. Some users reported difficulty achieving proper crush if the block surface is not perfectly flat. We recommend this for enthusiasts planning moderate to high boost levels. Skip it if you are on a tight budget or building a low-power engine.
- PermaTorqueMLS design with laser-welded stopper layers
- Includes wire ring for improved combustion seal
- Pre-applied coating for immediate sealing without re-torque
Pros: Excellent sealing under high cylinder pressure; No need for re-torquing after installation
Cons: Slightly more expensive than OEM alternatives
3. Cometic C5501-040 Head Gasket: Best for Boosted Builds
Cometic C5501 gaskets are a popular choice among LS builders aiming for high boost or nitrous. Based on manufacturer specs, the 0.040 inch thickness allows for higher compression ratios, and the multi-layer stainless steel construction resists blowout. Owner feedback from blown LS engines confirms reliability up to 25 psi. The gasket is also available in larger bore sizes for stroker builds.
However, this gasket is unforgiving of imperfect deck surfaces. We found multiple reports of seepage if the block and heads are not machined to a 50 RA finish or better. The cost is also higher than many alternatives. Skip this if you are not prepared to properly surface your engine or if you need a forgiving gasket for a quick rebuild.
- Thinner 0.040 inch compressed thickness for higher compression
- Available in multiple bore sizes and thicknesses
- High nickel content stainless steel layers for strength
Pros: Excellent for high-boost and high-CR applications; Customizable options for specific builds
Cons: Requires precise surface finish and torque sequence; More expensive than standard MLS gaskets
4. Victor Reinz 58926 Head Gasket: Best Budget MLS
The Victor Reinz 58926 offers a budget-friendly MLS option for owners rebuilding a stock 6.0 LS. In our comparison, it meets OEM specifications and provides adequate sealing for naturally aspirated engines. Owner feedback indicates it performs well in standard driving conditions and is easy to install with the pre-applied coating.
However, we found mixed reviews regarding long-term durability under heavy load. Some owners experienced minor coolant seepage after 50,000 miles, and it is not designed for boosted applications. Skip this if you plan to add a supercharger or turbo. It is best for budget-conscious rebuilds or stock replacements.
- Affordable MLS gasket with good sealing properties
- Pre-coated for immediate installation
- Direct replacement for stock 6.0 LS engines
Pros: Good value for stock or mild builds; Reliable sealing for daily driving
Cons: Not recommended for high-performance or boosted engines; Some reports of coolant seepage after many heat cycles
5. Mahle Original 5495 Head Gasket: Best for Aluminum Heads
Mahle Original 5495 is engineered for LS engines with aluminum heads, featuring a coating that minimizes galvanic corrosion between the steel gasket and aluminum. Based on manufacturer data, the coating also aids in sealing micro-surface imperfections. Owner feedback from builds with aftermarket aluminum heads reports no issues with coolant leaks or gasket degradation.
On the downside, this gasket is priced at a premium and may not be necessary for iron head engines. Some users noted that the coating can be damaged if the gasket is handled carelessly during installation. Skip this if you are using cast iron heads or if cost is a primary concern.
- Designed specifically for aluminum cylinder heads
- Special coating prevents galvanic corrosion
- Solid sealing layer construction
Pros: Excellent corrosion resistance with aluminum heads; Good sealing performance in stock and mild builds
Cons: Higher price than some other MLS gaskets; Limited availability for some LS variants
6. ARP 134-1001 Head Stud Kit (used with gasket): Best Stud Kit for Gasket Seal
The ARP 134-1001 head stud kit is not a gasket but an essential companion for maximizing gasket performance in high-power builds. In our research, using these studs with any of the above MLS gaskets dramatically reduces the chance of head lift under boost. Owner feedback from turbo LS builds credits these studs for maintaining clamp load after many heat cycles.
However, this product adds significant cost and installation complexity. It is unnecessary for stock engines where factory torque-to-yield bolts suffice. Skip this if you are on a strict budget or building a naturally aspirated engine under 450 horsepower. Only pair with a quality gasket for best results.
- Provides consistent clamping force for gasket sealing
- Reusable and stronger than factory bolts
- Includes hardened washers for even load distribution
Pros: Significantly improves gasket sealing under high boost; Can be reused multiple times
Cons: Not a head gasket itself, must be purchased with gasket; Installation requires careful torque procedure
7. SCE Gaskets ICS Copper Head Gasket: Best for Extreme Applications
SCE ICS copper head gaskets are for all-out race builds where no other gasket will survive. Based on manufacturer specs, the solid copper design can withstand over 40 psi of boost and extreme temperatures. Owner feedback from dedicated drag cars confirms they hold up under repeated abuse. The gasket can also be annealed and reused.
However, this is not a practical choice for street cars. Installation requires precision O-ringing of the block and heads, and even then, sealing can be finicky. The cost is high, and the gasket is unforgiving of surface imperfections. Skip this unless you are building a 1,000+ horsepower race engine. For most LS owners, an MLS gasket is a better choice.
- Solid copper construction for extreme heat and pressure
- Requires O-ringing block or receiver grooves
- Customizable thickness for compression ratio tuning
Pros: Handles extreme boost and nitrous levels; Can be reused after annealing
Cons: Very difficult to install and seal properly; Expensive and requires machine work
Frequently Asked Questions
What is the best head gasket for a 6.0 LS engine with a turbo?
For turbocharged 6.0 LS engines, we recommend the Cometic C5501 or Fel-Pro 26113PT. Both are MLS gaskets with wire rings that provide excellent sealing under boost. For extreme boost levels, consider SCE copper gaskets with O-ringing, but be prepared for complex installation.
Can I reuse head gaskets on a 6.0 LS?
No, head gaskets are designed for one-time use. Once compressed, they lose their ability to seal properly. Always replace with new gaskets and use new head bolts or studs for best results.
What is the difference between MLS and copper head gaskets?
MLS (multi-layer steel) gaskets are made of several layers of steel with elastomeric coatings. They are easier to install and seal well for most builds up to moderate boost. Copper gaskets are solid metal, require O-ringing, and are used for extreme high-boost or high-compression applications. Copper can be reused after annealing.
Do I need to use head studs with aftermarket head gaskets?
For stock or mild builds, factory torque-to-yield bolts are sufficient. For boosted engines or builds over 500 horsepower, we recommend ARP head studs to provide consistent clamp load and prevent head lift.
What is the correct torque spec for 6.0 LS head gaskets?
Torque specs vary by gasket and fastener. For GM MLS gaskets with factory bolts, the spec is typically 22 ft-lbs first pass, then 90 degrees, then 70 degrees. Always follow the gasket manufacturer’s instructions and use a torque angle gauge.
Our Verdict
After researching and comparing, our top pick for most 6.0 LS owners is the Fel-Pro 26113PT PermaTorqueMLS for its excellent sealing under boost and ease of installation. For those on a budget or building a stock engine, the Victor Reinz 58926 offers good value. If you are building a high-boost race engine, the Cometic C5501 or SCE copper gasket paired with ARP studs is the way to go.
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