Twin Power Lower Rocker Box Gaskets for Harley-Davidson 84-99 Evolution Big Twin

SKU: TWP043203
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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 TwinPower

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

Essential Lower Rocker Box Gaskets for Harley-Davidson Evolution Big Twin (1984-1999)

Maintain the integrity of your classic Harley-Davidson Evolution Big Twin engine with this set of Lower Rocker Box Gaskets from Twin Power. Designed to replace Harley-Davidson part number 17038-90, these gaskets are vital for preventing oil leaks and ensuring your engine runs cleanly and efficiently. Crafted from durable materials, they are built to withstand the unique demands of Evolution engines, offering reliable performance for your vintage ride.

Key Features and Benefits:

  • Direct Replacement: Engineered to fit and function like Harley-Davidson part #17038-90.
  • High-Quality Materials: Constructed for durability and resistance to engine oil and heat.
  • Leak-Free Seal: Provides a secure seal for the lower rocker boxes, preventing messy oil leaks.
  • Engine Longevity: Helps protect your engine by maintaining proper lubrication and preventing contamination.
  • Specific Fitment: Designed for 1984-1999 Harley-Davidson Evolution Big Twin models.

Vehicle Compatibility:

This gasket kit is compatible with a wide range of Harley-Davidson Evolution Big Twin models from 1984 to 1999, including:

  • FLHT/FLHTC Electra Glide models
  • FLST/FLSTC Heritage Softail models
  • FXR/FXRS/FXRT models
  • FXST/FXSTC Softail models
  • And other Evolution Big Twin applications

Trust Twin Power for quality components that keep your classic Harley running smoothly. Get your Evolution Big Twin Lower Rocker Box Gaskets today at GGCRACING!

Vehicle Fitment

Years Make Model Trim
1997-1999 Harley-Davidson FLHR Road King Base
1998-1999 Harley-Davidson FLHRCI Road King Classic Base
1996-1997 Harley-Davidson FLHRI Road King Base
1984 Harley-Davidson FLHS Electra Glide Sport Base
1995-1999 Harley-Davidson FLHT Electra Glide Standard Base
1984-1999 Harley-Davidson FLHTC Electra Glide Classic Base
1996-1999 Harley-Davidson FLHTCI Electra Glide Classic Base
1989-1997 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
1986-1990 Harley-Davidson FLST Heritage Softail Base
1988-1999 Harley-Davidson FLSTC Heritage Softail Classic Base
1990-1999 Harley-Davidson FLSTF Fat Boy Base
1994-1996 Harley-Davidson FLSTN Heritage Softail Special Base
1996 Harley-Davidson FLTCUI Tour Glide Ultra Classic Base
1998-1999 Harley-Davidson FLTR Road Glide Base
1998-1999 Harley-Davidson FLTRI Road Glide Base
1995-1999 Harley-Davidson FXD Dyna Super Glide Base
1994-1999 Harley-Davidson FXDS-Conv Dyna Convertible Base
1993-1999 Harley-Davidson FXDWG Dyna Wide Glide Base
1999 Harley-Davidson FXDX Dyna Super Glide Sport Base
1984-1994 Harley-Davidson FXR Super Glide II Base
1999 Harley-Davidson FXR2 Base
1985-1987 Harley-Davidson FXRC Low Rider Chrome Base
1986 Harley-Davidson FXRD Sport Glide Grand Touring Base
1984 Harley-Davidson FXRDG Disc Glide Base
1985-1995 Harley-Davidson FXRPF Police Base
1984-1992 Harley-Davidson FXRS Low Glide Base
1984-1992 Harley-Davidson FXRT Sport Glide Base
1984-1999 Harley-Davidson FXST Softail Standard Base
1999 Harley-Davidson FXSTB Night Train Base
1986-1999 Harley-Davidson FXSTC Softail Custom Base
1995-1997 Harley-Davidson FXSTSB Bad Boy Base

Product Details

Product Description
Part Numbers
Sizing & Fit

About TwinPower

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

Essential Lower Rocker Box Gaskets for Harley-Davidson Evolution Big Twin (1984-1999)

Maintain the integrity of your classic Harley-Davidson Evolution Big Twin engine with this set of Lower Rocker Box Gaskets from Twin Power. Designed to replace Harley-Davidson part number 17038-90, these gaskets are vital for preventing oil leaks and ensuring your engine runs cleanly and efficiently. Crafted from durable materials, they are built to withstand the unique demands of Evolution engines, offering reliable performance for your vintage ride.

Key Features and Benefits:

  • Direct Replacement: Engineered to fit and function like Harley-Davidson part #17038-90.
  • High-Quality Materials: Constructed for durability and resistance to engine oil and heat.
  • Leak-Free Seal: Provides a secure seal for the lower rocker boxes, preventing messy oil leaks.
  • Engine Longevity: Helps protect your engine by maintaining proper lubrication and preventing contamination.
  • Specific Fitment: Designed for 1984-1999 Harley-Davidson Evolution Big Twin models.

Vehicle Compatibility:

This gasket kit is compatible with a wide range of Harley-Davidson Evolution Big Twin models from 1984 to 1999, including:

  • FLHT/FLHTC Electra Glide models
  • FLST/FLSTC Heritage Softail models
  • FXR/FXRS/FXRT models
  • FXST/FXSTC Softail models
  • And other Evolution Big Twin applications

Trust Twin Power for quality components that keep your classic Harley running smoothly. Get your Evolution Big Twin Lower Rocker Box Gaskets today at GGCRACING!

Vehicle Fitment

Years Make Model Trim
1997-1999 Harley-Davidson FLHR Road King Base
1998-1999 Harley-Davidson FLHRCI Road King Classic Base
1996-1997 Harley-Davidson FLHRI Road King Base
1984 Harley-Davidson FLHS Electra Glide Sport Base
1995-1999 Harley-Davidson FLHT Electra Glide Standard Base
1984-1999 Harley-Davidson FLHTC Electra Glide Classic Base
1996-1999 Harley-Davidson FLHTCI Electra Glide Classic Base
1989-1997 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
1986-1990 Harley-Davidson FLST Heritage Softail Base
1988-1999 Harley-Davidson FLSTC Heritage Softail Classic Base
1990-1999 Harley-Davidson FLSTF Fat Boy Base
1994-1996 Harley-Davidson FLSTN Heritage Softail Special Base
1996 Harley-Davidson FLTCUI Tour Glide Ultra Classic Base
1998-1999 Harley-Davidson FLTR Road Glide Base
1998-1999 Harley-Davidson FLTRI Road Glide Base
1995-1999 Harley-Davidson FXD Dyna Super Glide Base
1994-1999 Harley-Davidson FXDS-Conv Dyna Convertible Base
1993-1999 Harley-Davidson FXDWG Dyna Wide Glide Base
1999 Harley-Davidson FXDX Dyna Super Glide Sport Base
1984-1994 Harley-Davidson FXR Super Glide II Base
1999 Harley-Davidson FXR2 Base
1985-1987 Harley-Davidson FXRC Low Rider Chrome Base
1986 Harley-Davidson FXRD Sport Glide Grand Touring Base
1984 Harley-Davidson FXRDG Disc Glide Base
1985-1995 Harley-Davidson FXRPF Police Base
1984-1992 Harley-Davidson FXRS Low Glide Base
1984-1992 Harley-Davidson FXRT Sport Glide Base
1984-1999 Harley-Davidson FXST Softail Standard Base
1999 Harley-Davidson FXSTB Night Train Base
1986-1999 Harley-Davidson FXSTC Softail Custom Base
1995-1997 Harley-Davidson FXSTSB Bad Boy Base

Product Details

Product Description

About TwinPower

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

Essential Lower Rocker Box Gaskets for Harley-Davidson Evolution Big Twin (1984-1999)

Maintain the integrity of your classic Harley-Davidson Evolution Big Twin engine with this set of Lower Rocker Box Gaskets from Twin Power. Designed to replace Harley-Davidson part number 17038-90, these gaskets are vital for preventing oil leaks and ensuring your engine runs cleanly and efficiently. Crafted from durable materials, they are built to withstand the unique demands of Evolution engines, offering reliable performance for your vintage ride.

Key Features and Benefits:

  • Direct Replacement: Engineered to fit and function like Harley-Davidson part #17038-90.
  • High-Quality Materials: Constructed for durability and resistance to engine oil and heat.
  • Leak-Free Seal: Provides a secure seal for the lower rocker boxes, preventing messy oil leaks.
  • Engine Longevity: Helps protect your engine by maintaining proper lubrication and preventing contamination.
  • Specific Fitment: Designed for 1984-1999 Harley-Davidson Evolution Big Twin models.

Vehicle Compatibility:

This gasket kit is compatible with a wide range of Harley-Davidson Evolution Big Twin models from 1984 to 1999, including:

  • FLHT/FLHTC Electra Glide models
  • FLST/FLSTC Heritage Softail models
  • FXR/FXRS/FXRT models
  • FXST/FXSTC Softail models
  • And other Evolution Big Twin applications

Trust Twin Power for quality components that keep your classic Harley running smoothly. Get your Evolution Big Twin Lower Rocker Box Gaskets today at GGCRACING!

Vehicle Fitment

Years Make Model Trim
1997-1999 Harley-Davidson FLHR Road King Base
1998-1999 Harley-Davidson FLHRCI Road King Classic Base
1996-1997 Harley-Davidson FLHRI Road King Base
1984 Harley-Davidson FLHS Electra Glide Sport Base
1995-1999 Harley-Davidson FLHT Electra Glide Standard Base
1984-1999 Harley-Davidson FLHTC Electra Glide Classic Base
1996-1999 Harley-Davidson FLHTCI Electra Glide Classic Base
1989-1997 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
1986-1990 Harley-Davidson FLST Heritage Softail Base
1988-1999 Harley-Davidson FLSTC Heritage Softail Classic Base
1990-1999 Harley-Davidson FLSTF Fat Boy Base
1994-1996 Harley-Davidson FLSTN Heritage Softail Special Base
1996 Harley-Davidson FLTCUI Tour Glide Ultra Classic Base
1998-1999 Harley-Davidson FLTR Road Glide Base
1998-1999 Harley-Davidson FLTRI Road Glide Base
1995-1999 Harley-Davidson FXD Dyna Super Glide Base
1994-1999 Harley-Davidson FXDS-Conv Dyna Convertible Base
1993-1999 Harley-Davidson FXDWG Dyna Wide Glide Base
1999 Harley-Davidson FXDX Dyna Super Glide Sport Base
1984-1994 Harley-Davidson FXR Super Glide II Base
1999 Harley-Davidson FXR2 Base
1985-1987 Harley-Davidson FXRC Low Rider Chrome Base
1986 Harley-Davidson FXRD Sport Glide Grand Touring Base
1984 Harley-Davidson FXRDG Disc Glide Base
1985-1995 Harley-Davidson FXRPF Police Base
1984-1992 Harley-Davidson FXRS Low Glide Base
1984-1992 Harley-Davidson FXRT Sport Glide Base
1984-1999 Harley-Davidson FXST Softail Standard Base
1999 Harley-Davidson FXSTB Night Train Base
1986-1999 Harley-Davidson FXSTC Softail Custom Base
1995-1997 Harley-Davidson FXSTSB Bad Boy Base

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