Cometic Gasket Big Twin Top End Gasket Kit — Fits 1984-1991 Harley-Davidson Models

SKU: CGSC9747
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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 Cometic Gasket

Cometic Gasket is the world leader in custom multi-layer steel head gaskets for performance and motorsport engines. From off-the-shelf MLS for popular platforms to bespoke gaskets for race-only builds, Cometic seals everything from Honda B-series to LSX.

Watch in action

Cometic Big Twin Top End Gasket Kit: Unmatched Performance for Your Harley-Davidson

Modern V-twin engines demand superior sealing solutions, and the Cometic Big Twin Top End Gasket Kit is engineered to meet and exceed those demands. Designed for Harley-Davidson Big Twin models from 1984 to 1991, this kit provides the critical components needed to ensure optimal engine performance, reliability, and longevity. Whether you're rebuilding your engine or performing routine maintenance, trust Cometic Gasket for precision-engineered parts.

Engineered for Power and Durability

  • Application Specific: Tailored for 1984-1991 Harley-Davidson Big Twin engines, ensuring a perfect fit and seal.
  • High-Quality Materials: Cometic utilizes premium materials manufactured in the USA, chosen for their ability to withstand extreme temperatures, high cylinder pressures, and significant clamp loads.
  • Enhanced Performance: This kit is designed to maximize your engine's power output and ensure consistent performance under demanding conditions.
  • Leak Prevention: Expertly crafted gaskets prevent leaks, protecting your engine from contaminants and maintaining optimal compression.
  • USA Made: Proudly manufactured in the USA, reflecting a commitment to quality and domestic production.

Cometic Gasket is dedicated to innovation in sealing technology. Their extensive library of gaskets covers a wide range of Powersports, Street Bikes, Snowmobiles, and V-Twin applications. By choosing this top-end gasket kit, you are investing in the durability and performance of your Harley-Davidson. Experience the difference that quality American-made components make for your ride.

Upgrade your Harley-Davidson's top end with the reliability and performance only Cometic Gasket can provide. Find this essential kit and more at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1984 Harley-Davidson FLHS Electra Glide Sport Base
1987-1991 Harley-Davidson FLHS Electra Glide Sport Base
1986-1990 Harley-Davidson FLST Heritage Softail Base
1988-1991 Harley-Davidson FLSTC Heritage Softail Classic Base
1990-1991 Harley-Davidson FLSTF Fat Boy Base
1984-1991 Harley-Davidson FXRS Low Glide Base
1984-1991 Harley-Davidson FXRT Sport Glide Base
1984-1991 Harley-Davidson FXST Softail Standard Base
1986-1991 Harley-Davidson FXSTC Softail Custom Base
1988-1991 Harley-Davidson FXSTS Springer Softail Base

Product Details

Product Description
Part Numbers
Sizing & Fit

About Cometic Gasket

Cometic Gasket is the world leader in custom multi-layer steel head gaskets for performance and motorsport engines. From off-the-shelf MLS for popular platforms to bespoke gaskets for race-only builds, Cometic seals everything from Honda B-series to LSX.

Watch in action

Cometic Big Twin Top End Gasket Kit: Unmatched Performance for Your Harley-Davidson

Modern V-twin engines demand superior sealing solutions, and the Cometic Big Twin Top End Gasket Kit is engineered to meet and exceed those demands. Designed for Harley-Davidson Big Twin models from 1984 to 1991, this kit provides the critical components needed to ensure optimal engine performance, reliability, and longevity. Whether you're rebuilding your engine or performing routine maintenance, trust Cometic Gasket for precision-engineered parts.

Engineered for Power and Durability

  • Application Specific: Tailored for 1984-1991 Harley-Davidson Big Twin engines, ensuring a perfect fit and seal.
  • High-Quality Materials: Cometic utilizes premium materials manufactured in the USA, chosen for their ability to withstand extreme temperatures, high cylinder pressures, and significant clamp loads.
  • Enhanced Performance: This kit is designed to maximize your engine's power output and ensure consistent performance under demanding conditions.
  • Leak Prevention: Expertly crafted gaskets prevent leaks, protecting your engine from contaminants and maintaining optimal compression.
  • USA Made: Proudly manufactured in the USA, reflecting a commitment to quality and domestic production.

Cometic Gasket is dedicated to innovation in sealing technology. Their extensive library of gaskets covers a wide range of Powersports, Street Bikes, Snowmobiles, and V-Twin applications. By choosing this top-end gasket kit, you are investing in the durability and performance of your Harley-Davidson. Experience the difference that quality American-made components make for your ride.

Upgrade your Harley-Davidson's top end with the reliability and performance only Cometic Gasket can provide. Find this essential kit and more at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1984 Harley-Davidson FLHS Electra Glide Sport Base
1987-1991 Harley-Davidson FLHS Electra Glide Sport Base
1986-1990 Harley-Davidson FLST Heritage Softail Base
1988-1991 Harley-Davidson FLSTC Heritage Softail Classic Base
1990-1991 Harley-Davidson FLSTF Fat Boy Base
1984-1991 Harley-Davidson FXRS Low Glide Base
1984-1991 Harley-Davidson FXRT Sport Glide Base
1984-1991 Harley-Davidson FXST Softail Standard Base
1986-1991 Harley-Davidson FXSTC Softail Custom Base
1988-1991 Harley-Davidson FXSTS Springer Softail Base

Product Details

Product Description

About Cometic Gasket

Cometic Gasket is the world leader in custom multi-layer steel head gaskets for performance and motorsport engines. From off-the-shelf MLS for popular platforms to bespoke gaskets for race-only builds, Cometic seals everything from Honda B-series to LSX.

Watch in action

Cometic Big Twin Top End Gasket Kit: Unmatched Performance for Your Harley-Davidson

Modern V-twin engines demand superior sealing solutions, and the Cometic Big Twin Top End Gasket Kit is engineered to meet and exceed those demands. Designed for Harley-Davidson Big Twin models from 1984 to 1991, this kit provides the critical components needed to ensure optimal engine performance, reliability, and longevity. Whether you're rebuilding your engine or performing routine maintenance, trust Cometic Gasket for precision-engineered parts.

Engineered for Power and Durability

  • Application Specific: Tailored for 1984-1991 Harley-Davidson Big Twin engines, ensuring a perfect fit and seal.
  • High-Quality Materials: Cometic utilizes premium materials manufactured in the USA, chosen for their ability to withstand extreme temperatures, high cylinder pressures, and significant clamp loads.
  • Enhanced Performance: This kit is designed to maximize your engine's power output and ensure consistent performance under demanding conditions.
  • Leak Prevention: Expertly crafted gaskets prevent leaks, protecting your engine from contaminants and maintaining optimal compression.
  • USA Made: Proudly manufactured in the USA, reflecting a commitment to quality and domestic production.

Cometic Gasket is dedicated to innovation in sealing technology. Their extensive library of gaskets covers a wide range of Powersports, Street Bikes, Snowmobiles, and V-Twin applications. By choosing this top-end gasket kit, you are investing in the durability and performance of your Harley-Davidson. Experience the difference that quality American-made components make for your ride.

Upgrade your Harley-Davidson's top end with the reliability and performance only Cometic Gasket can provide. Find this essential kit and more at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1984 Harley-Davidson FLHS Electra Glide Sport Base
1987-1991 Harley-Davidson FLHS Electra Glide Sport Base
1986-1990 Harley-Davidson FLST Heritage Softail Base
1988-1991 Harley-Davidson FLSTC Heritage Softail Classic Base
1990-1991 Harley-Davidson FLSTF Fat Boy Base
1984-1991 Harley-Davidson FXRS Low Glide Base
1984-1991 Harley-Davidson FXRT Sport Glide Base
1984-1991 Harley-Davidson FXST Softail Standard Base
1986-1991 Harley-Davidson FXSTC Softail Custom Base
1988-1991 Harley-Davidson FXSTS Springer Softail Base

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