7 Best SBC Header Gaskets (Researched and Compared)

We researched and compared the top header gaskets for Small Block Chevy (SBC) engines, evaluating manufacturer specifications, published industry standards, and aggregated owner feedback. Our goal is to help you find a reliable seal for your exhaust headers, whether you’re building a high-performance race engine or restoring a daily driver.

Each gasket was assessed for material composition, heat resistance, compression characteristics, and real-world durability. We also considered ease of installation and long-term sealing performance. Below are our findings, with honest assessments of each product’s strengths and weaknesses.

1. Fel-Pro 1404 Exhaust Header Gasket: Best Overall

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The Fel-Pro 1404 is a well-known performer in the SBC community. We researched its construction: a perforated steel core laminated with graphite. This combination provides a conformable seal that adapts to minor port irregularities while the steel core prevents gasket failure under high exhaust pressures. Owner feedback consistently highlights its ability to hold a seal even after multiple heat cycles, making it a reliable choice for street and mild race applications.

However, the graphite facing is somewhat delicate during installation. Over-torquing can cause it to crush or tear, so careful handling and proper torque specs are essential. If you frequently remove and reinstall headers, this gasket may not last as many cycles as a solid copper or multi-layer steel design. It is best for those who want a proven, long-lasting seal without the need for frequent header removal.

• Proven sealing with graphite composite that conforms to uneven surfaces
• Perforated steel core resists blowout and maintains integrity under high heat
• Direct fit for standard SBC exhaust ports with 3/8 in. bolt holes

Pros: Excellent heat resistance up to 2000°F intermittent; Consistent sealing reported by owners over long periods
Cons: Graphite can be fragile during handling if not careful

2. Mr. Gasket 5710 Ultra-Seal Header Gasket: Best for High Heat

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The Mr. Gasket 5710 is a solid copper gasket designed for high-heat environments. Based on our evaluation of manufacturer specs, copper gaskets excel where temperatures exceed the limits of composite materials. Owners report that these gaskets seal well when installed with care, and they can be reused after annealing, which adds to their value for racers who frequently disassemble engines.

The main drawback is that copper is relatively soft and can extrude or leak if over-torqued. It also requires a perfectly flat header flange and cylinder head surface to seal effectively. If your headers or heads are warped or have imperfections, a composite gasket may be a better choice. This gasket is best for racers and enthusiasts who prioritize heat resistance and reusability.

• Solid copper construction withstands extreme temperatures without degradation
• Annealed copper conforms to port surfaces for a tight seal
• Reusable if handled carefully and re-annealed

Pros: Exceptional heat tolerance, ideal for turbo or nitrous applications; Can be reused after annealing, offering long-term value
Cons: Requires precise torquing; too much torque can cause copper to extrude

3. Remflex 6001 Exhaust Header Gasket: Best for Uneven Surfaces

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The Remflex 6001 is engineered for problematic sealing surfaces. We compared its specifications: it is made from a dense, flexible graphite that compresses significantly to fill irregularities. Owner feedback indicates that it is particularly effective on headers with slight flange warpage or on heads that have been resurfaced. Many users report that it seals on the first try, eliminating the need for multiple gasket replacements.

However, once compressed, the gasket becomes somewhat fragile. If you need to remove the headers, the gasket often disintegrates and must be replaced. It is also not recommended for applications where the header is frequently removed. This gasket is best for those who want a one-time, reliable seal on less-than-perfect surfaces and do not plan on regular header removal.

• Highly compressible graphite fills gaps up to 0.050 in. for imperfect flanges
• No retorquing required after initial installation
• Resists exhaust gases and high temperatures

Pros: Excellent at sealing warped or mismatched surfaces; Simple installation with no need for sealant
Cons: Graphite can shed debris if disturbed after installation

4. Hedman Hedders 26030 Header Gasket: Best Budget Pick

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The Hedman 26030 is a budget-friendly MLS gasket that offers solid performance for the price. We researched its design: multiple layers of steel with embossed beads that create a seal when compressed. This type of gasket is common in OEM applications and provides good heat resistance and durability. Owner reviews indicate that it works well on properly prepared surfaces and holds up under moderate to high heat.

The limitation is that MLS gaskets are unforgiving of surface imperfections. If your header flanges or cylinder head are not perfectly flat, you may experience leaks. It also has a thin profile, which may not fill gaps as well as thicker composite gaskets. This gasket is best for budget-conscious builders who have flat sealing surfaces and want a durable, no-fuss option.

• Multi-layer steel (MLS) construction for durability and heat resistance
• Embossed beads provide a positive seal at each layer
• Thin profile helps maintain header alignment

Pros: Affordable option with good sealing performance; Resists blowout better than some composite gaskets
Cons: Requires very flat surfaces to seal effectively

5. Permatex 80335 High Tack Spray-A-Gasket: Best Sealant for Gaskets

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The Permatex 80335 is a high-tack aerosol sealant designed to complement header gaskets. We evaluated its role based on manufacturer instructions and owner feedback. It is applied to both sides of a gasket to hold it in place and fill tiny gaps. Many users report that it helps achieve a leak-free seal, especially with composite gaskets on less-than-perfect surfaces. It also makes installation easier by preventing the gasket from shifting.

However, this product is not a substitute for a proper gasket. It can also make removal more difficult, as it bonds the gasket to both surfaces. If you frequently change headers, this may be a drawback. It is best for those who want extra sealing assurance and do not mind the added cleanup during disassembly.

• Creates a tacky surface to hold gaskets in place during assembly
• Fills minor imperfections for improved sealing
• Works with paper, rubber, cork, and composite gaskets

Pros: Helps prevent gasket movement during installation; Can revive old gaskets by improving adhesion
Cons: Not a standalone gasket; must be used with a base gasket

6. Dura-Bond 1910 Header Gasket: Best Heavy-Duty

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The Dura-Bond 1910 is a robust copper and wire mesh gasket designed for demanding conditions. We researched its construction: a thick copper layer reinforced with wire mesh, providing additional strength and resistance to extrusion. Owner feedback indicates that it holds up well in high-horsepower applications and can withstand repeated heat cycles without failure. Its thickness also helps bridge minor surface gaps.

The downside is that its thickness can make installation tricky; if not torqued evenly, it may cause header flange distortion. It is also relatively expensive compared to other options. This gasket is best for racers or builders with high-output engines who prioritize durability over ease of installation.

• Copper and wire mesh composite for enhanced strength
• Thicker design fills larger gaps
• Resists crushing and blowout

Pros: Very durable and resistant to high torque; Good for heavy-duty or racing applications
Cons: Requires careful torque sequence to avoid distortion

7. SCE Gaskets IC-1462 Copper Header Gasket: Best for Pro Racing

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The SCE IC-1462 is a premium copper gasket with an integral wire ring, intended for professional racing. We compared its specifications to other copper gaskets: the wire ring creates a high-pressure seal that is ideal for forced induction or nitrous applications. Owner feedback from racing forums confirms that it performs well under extreme conditions, but it demands meticulous installation and perfectly flat surfaces.

Its high cost and specialized nature make it overkill for most street-driven SBCs. Additionally, it can be difficult to source and may have longer lead times. This gasket is best for serious racers who need maximum sealing integrity and are willing to invest in proper setup and maintenance.

• Integral wire ring provides a positive seal at high cylinder pressures
• Copper construction handles extreme heat without degradation
• Designed for professional racing environments

Pros: Excellent sealing under high boost or nitrous; Can be reused after annealing
Cons: Very expensive, not cost-effective for street use; Requires precise surface preparation and installation

Frequently Asked Questions

What is the best header gasket material for SBC engines?

The best material depends on your application. For most street and mild performance builds, graphite composite gaskets like the Fel-Pro 1404 offer a good balance of conformability and heat resistance. For high-heat or racing applications, solid copper gaskets (e.g., Mr. Gasket 5710) or multi-layer steel (MLS) gaskets are preferred. We recommend matching the gasket material to your engine’s operating conditions and header flange flatness.

Can I reuse header gaskets after removal?

Some gaskets can be reused, but it depends on the material. Solid copper gaskets can be annealed and reused if they are not damaged. Graphite composite gaskets often disintegrate upon removal and should be replaced. MLS gaskets may be reusable if the embossed beads are not crushed flat, but it is generally not recommended. For best results, always use new gaskets when reinstalling headers.

How tight should I torque header gaskets?

Torque specifications vary by gasket type and header manufacturer. As a general guideline, most header gaskets require 15-25 ft-lbs of torque. Copper gaskets are softer and may need less torque (around 15-20 ft-lbs), while MLS gaskets can tolerate higher torque. Always follow the gasket manufacturer’s recommended torque specs and use a torque wrench to avoid over-tightening, which can cause leaks or damage.

Do I need to use sealant with header gaskets?

Not always. Many modern gaskets are designed to seal without additional sealant. However, if you have slightly uneven surfaces or want extra assurance, a high-tack spray like Permatex 80335 can help hold the gasket in place and fill minor imperfections. Avoid using silicone-based sealants, as they can degrade under high exhaust heat and cause leaks.

Why do my header gaskets keep blowing out?

Blowouts are often caused by improper torque, uneven flange surfaces, or excessive exhaust backpressure. Ensure that your header flanges and cylinder head surfaces are flat and free of debris. Use a quality gasket appropriate for your heat levels and torque it evenly in a cross pattern. If blowouts persist, consider upgrading to a thicker or more durable gasket material like copper or MLS.

Our Verdict

After researching and comparing the top SBC header gaskets, our top pick is the Fel-Pro 1404 for its proven sealing performance, durability, and ease of installation. It is versatile enough for most street and mild race applications. For those facing high heat or needing reusability, the Mr. Gasket 5710 solid copper gasket is an excellent runner-up, especially for turbo or nitrous builds.