Clevite77 MS20117 Header Gasket Set MLS - 1.85" x 1.9" Square Port Multi-Layer Steel — Fits Big Block Chevy

SKU: BBKS_MS20117
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Clevite77

Clevite77 engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Clevite77 lineup with fast shipping and expert fitment support — order with confidence.

Uncompromising Exhaust Seal for Your Big Block Chevy

Unleash the full power of your Big Block Chevy engine with the Clevite77 MS20117 Header Gasket Set. Designed for the extreme exhaust temperatures and pressures generated by high-performance BBC engines, these Multi-Layer Steel (MLS) gaskets provide an unyielding, airtight seal between your headers and cylinder heads. A proper exhaust seal is absolutely paramount for maximizing horsepower, ensuring accurate O2 sensor readings for optimal engine tuning, and preventing annoying exhaust leaks that can diminish performance, create unwanted noise, and potentially lead to heat damage to surrounding components. Trust Clevite77's expertise for a bulletproof seal in your BBC build.

Multi-Layer Steel Durability for BBC Square Ports

The Clevite77 MS20117 header gasket set is specifically engineered for Big Block Chevy engines with 1.850 x 1.900 inch square exhaust ports. The advanced Multi-Layer Steel (MLS) construction is renowned for its superior durability, exceptional heat resistance, and unparalleled ability to maintain a consistent seal even under the most demanding racing conditions. Unlike traditional composite gaskets, MLS gaskets offer enhanced resilience against thermal cycling, vibration, and extreme pressure, ensuring a long-lasting, leak-free connection that won't blow out when you need it most. This robust design guarantees optimal exhaust scavenging and maximum power output.

Key Features & Performance Advantages:

  • Engine Fitment: Optimized specifically for Big Block Chevy (BBC) engines, ensuring perfect compatibility.
  • Port Configuration: Precision-cut for 1.850" x 1.900" square exhaust ports, guaranteeing optimal flow and sealing.
  • Material: Premium Multi-Layer Steel (MLS) construction for ultimate durability, superior heat management, and resistance to blow-out.
  • Seal Integrity: Effectively prevents exhaust leaks, maximizing horsepower and torque output while maintaining accurate sensor readings.
  • Longevity: Exceptional resistance to thermal stress, vibration, and pressure for an extended, reliable service life under extreme conditions.

The Ultimate Choice for BBC Exhaust Systems

For serious Big Block Chevy enthusiasts and racers, the Clevite77 MS20117 MLS header gasket set is the definitive choice for a bulletproof exhaust seal. Its robust construction, combined with precise fitment, ensures that every ounce of power is channeled efficiently, without compromise or the risk of leaks. Elevate your BBC's exhaust system performance and reliability with Clevite77, available now at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Clevite77

Clevite77 engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Clevite77 lineup with fast shipping and expert fitment support — order with confidence.

Uncompromising Exhaust Seal for Your Big Block Chevy

Unleash the full power of your Big Block Chevy engine with the Clevite77 MS20117 Header Gasket Set. Designed for the extreme exhaust temperatures and pressures generated by high-performance BBC engines, these Multi-Layer Steel (MLS) gaskets provide an unyielding, airtight seal between your headers and cylinder heads. A proper exhaust seal is absolutely paramount for maximizing horsepower, ensuring accurate O2 sensor readings for optimal engine tuning, and preventing annoying exhaust leaks that can diminish performance, create unwanted noise, and potentially lead to heat damage to surrounding components. Trust Clevite77's expertise for a bulletproof seal in your BBC build.

Multi-Layer Steel Durability for BBC Square Ports

The Clevite77 MS20117 header gasket set is specifically engineered for Big Block Chevy engines with 1.850 x 1.900 inch square exhaust ports. The advanced Multi-Layer Steel (MLS) construction is renowned for its superior durability, exceptional heat resistance, and unparalleled ability to maintain a consistent seal even under the most demanding racing conditions. Unlike traditional composite gaskets, MLS gaskets offer enhanced resilience against thermal cycling, vibration, and extreme pressure, ensuring a long-lasting, leak-free connection that won't blow out when you need it most. This robust design guarantees optimal exhaust scavenging and maximum power output.

Key Features & Performance Advantages:

  • Engine Fitment: Optimized specifically for Big Block Chevy (BBC) engines, ensuring perfect compatibility.
  • Port Configuration: Precision-cut for 1.850" x 1.900" square exhaust ports, guaranteeing optimal flow and sealing.
  • Material: Premium Multi-Layer Steel (MLS) construction for ultimate durability, superior heat management, and resistance to blow-out.
  • Seal Integrity: Effectively prevents exhaust leaks, maximizing horsepower and torque output while maintaining accurate sensor readings.
  • Longevity: Exceptional resistance to thermal stress, vibration, and pressure for an extended, reliable service life under extreme conditions.

The Ultimate Choice for BBC Exhaust Systems

For serious Big Block Chevy enthusiasts and racers, the Clevite77 MS20117 MLS header gasket set is the definitive choice for a bulletproof exhaust seal. Its robust construction, combined with precise fitment, ensures that every ounce of power is channeled efficiently, without compromise or the risk of leaks. Elevate your BBC's exhaust system performance and reliability with Clevite77, available now at GGCRACING.

Product Details

Product Description

About Clevite77

Clevite77 engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Clevite77 lineup with fast shipping and expert fitment support — order with confidence.

Uncompromising Exhaust Seal for Your Big Block Chevy

Unleash the full power of your Big Block Chevy engine with the Clevite77 MS20117 Header Gasket Set. Designed for the extreme exhaust temperatures and pressures generated by high-performance BBC engines, these Multi-Layer Steel (MLS) gaskets provide an unyielding, airtight seal between your headers and cylinder heads. A proper exhaust seal is absolutely paramount for maximizing horsepower, ensuring accurate O2 sensor readings for optimal engine tuning, and preventing annoying exhaust leaks that can diminish performance, create unwanted noise, and potentially lead to heat damage to surrounding components. Trust Clevite77's expertise for a bulletproof seal in your BBC build.

Multi-Layer Steel Durability for BBC Square Ports

The Clevite77 MS20117 header gasket set is specifically engineered for Big Block Chevy engines with 1.850 x 1.900 inch square exhaust ports. The advanced Multi-Layer Steel (MLS) construction is renowned for its superior durability, exceptional heat resistance, and unparalleled ability to maintain a consistent seal even under the most demanding racing conditions. Unlike traditional composite gaskets, MLS gaskets offer enhanced resilience against thermal cycling, vibration, and extreme pressure, ensuring a long-lasting, leak-free connection that won't blow out when you need it most. This robust design guarantees optimal exhaust scavenging and maximum power output.

Key Features & Performance Advantages:

  • Engine Fitment: Optimized specifically for Big Block Chevy (BBC) engines, ensuring perfect compatibility.
  • Port Configuration: Precision-cut for 1.850" x 1.900" square exhaust ports, guaranteeing optimal flow and sealing.
  • Material: Premium Multi-Layer Steel (MLS) construction for ultimate durability, superior heat management, and resistance to blow-out.
  • Seal Integrity: Effectively prevents exhaust leaks, maximizing horsepower and torque output while maintaining accurate sensor readings.
  • Longevity: Exceptional resistance to thermal stress, vibration, and pressure for an extended, reliable service life under extreme conditions.

The Ultimate Choice for BBC Exhaust Systems

For serious Big Block Chevy enthusiasts and racers, the Clevite77 MS20117 MLS header gasket set is the definitive choice for a bulletproof exhaust seal. Its robust construction, combined with precise fitment, ensures that every ounce of power is channeled efficiently, without compromise or the risk of leaks. Elevate your BBC's exhaust system performance and reliability with Clevite77, available now at GGCRACING.

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