BIGLKNM Top-End Gasket Kit for Harley EVO Big Twin 80ci 1340cc — Silicone Head Gaskets, Complete Seal Set

This full top-end gasket kit includes head gaskets, cylinder base gaskets, rocker cover gaskets, intake seals, O-rings and backing plates to restore proper sealing for late-model EVO Big Twin engines. Built with silicone head gaskets and NBR (nitrile) O-rings and seals, the set is intended for routine engine rebuilds, top-end jobs, or whenever a reliable replacement of all upper-end sealing components is required. The kit covers many Dyna, Softail, Super Glide and Touring variants built in the 1980s and 1990s.

Which Harley models and years will this kit fit?

The BIGLKNM kit fits a broad selection of EVO Big Twin 80ci (1340cc) motorcycles. It’s specified for various Dyna, Softail, Super Glide and Touring models produced during the 1980s and 1990s, including several EFI and anniversary editions.

• Dyna family: 1994–1998 Low Rider, FXDL, FXDB, FXRP Police and convertible/custom variants.
• Super Glide: multiple FXD and EFI model variants including FXDI, FXDCI, FXDWG series.
• Touring: FLT/FLTC/Ultra Classic and Ultra Glide EFI versions (FLTCI, FLTCUI).
• Softail: FXST/Fxstc and related 1984–1998 Softail Evolution models.

What materials are used and why do they matter?

BIGLKNM uses silicone for the head gaskets and NBR (nitrile) for O-rings and seals, chosen for heat tolerance and oil resistance. These materials provide a balance of flexibility and durability suitable for air-cooled EVO engines operating at higher temperatures and oil exposure.

• Silicone head gaskets: resist compression set and high cylinder temperatures.
• NBR O-rings/seals: durable against engine oil and common fuels.
• Precision-cut backing plates and washers: help ensure consistent clamping and sealing.
• Complete set: reduces the risk of missing a required seal during reassembly.

What parts are included in the full top-end set?

The package supplies all the primary sealing pieces needed for a top-end rebuild, so you won’t have to source multiple separate gaskets. The kit is designed to provide a one-stop replacement for the upper engine sealing surfaces.

• Head gasket(s) and cylinder base gasket(s) for both cylinders.
• Upper and lower rocker cover gaskets, intake manifold gaskets and backing plates.
• Various O-rings, rubber seals, washers and small hardware pieces.
• Complete contents shown in product images for quick verification before installation.

How will this kit affect a top-end service or rebuild?

Using a comprehensive gasket kit simplifies teardown and reassembly by providing matched sealing components and materials. It helps ensure uniform sealing surfaces and reduces the chance of leaks commonly caused by aging or mismatched gaskets.

• Speeds up maintenance by including all necessary upper-end seals in one box.
• Provides like-for-like replacements for original EVO top-end components.
• Helps achieve reliable compression sealing and prevents oil or air leaks.
• Ideal for preventative maintenance or during head/cylinder work.

Who is this for: The BIGLKNM Top End Gasket Kit is meant for DIY mechanics, professional motorcycle technicians and restoration enthusiasts working on Harley-Davidson EVO Big Twin 80ci (1340cc) engines from the listed Dyna, Softail, Super Glide and Touring model years. If you’re planning a top-end rebuild, valve job, or replacing worn seals, this kit supplies the matched components needed to complete the job correctly.