S&S Cycle 36-84 BT 3-1/2in Standard 80in HC Forged Pistons

These 3-1/2" standard bore high compression pistons fit 1979-'84 74" HD® big twin engines, producing 9:1 compression with stock unmodified cylinder heads.. The modern alloys used in these pistons, coupled with the advanced skirt profiles, allow them to be fit tighter resulting in low engine noise and long engine life. In the past, this could only be achieved with weaker cast pistons. S&S® will fit these pistons to your existing cylinders (when purchasing new cylinders, pistons can be fit to them as an option).

S&S Cycle 106-5519 high-compression forged pistons are designed for 1979-1984 Harley-Davidson 74-inch Big Twin engines. This piston set uses a standard bore configuration and produces a 9:1 compression ratio with stock, unmodified cylinder heads, making it a practical upgrade for compatible engine rebuilds and performance applications.

Advanced piston alloys and carefully developed skirt profiles allow these pistons to be fitted more tightly than traditional cast pistons. The result is reduced piston noise, improved durability, and long engine life while maintaining the strength benefits of a forged design. S&S Cycle can fit these pistons to existing cylinders, and piston fitting may also be selected when purchasing new cylinders.

These pistons are engineered for select Harley-Davidson Big Twin applications, including FLH Electra Glide, FLHS Electra Glide Sport, FLT Tour Glide, and FXR Super Glide II models from the listed model years. Verify engine configuration, cylinder compatibility, compression requirements, and installation specifications before ordering. Professional installation and appropriate cylinder preparation are recommended for reliable performance.

Feature: Standard bore forged piston design for compatible 74-inch Harley-Davidson Big Twin engines.
Feature: Produces a 9:1 compression ratio with stock, unmodified cylinder heads.
Feature: Advanced alloy construction supports strength and durability.
Feature: Precision skirt profile allows tighter fitting for reduced engine noise and extended service life.
Feature: Can be fitted to existing cylinders or ordered with fitting for new cylinders.

Features:

• Standard bore forged piston design for compatible 74-inch Harley-Davidson Big Twin engines
• Produces a 9:1 compression ratio with stock, unmodified cylinder heads
• Advanced alloy construction supports strength and durability
• Precision skirt profile allows tighter fitting for reduced engine noise and extended service life
• Can be fitted to existing cylinders or ordered with fitting for new cylinders

Fitment:
Harley Davidson FLH Electra Glide Base 1979
Harley Davidson FLH Electra Glide Base 1980
Harley Davidson FLH Electra Glide Base 1981
Harley Davidson FLH Electra Glide Base 1982
Harley Davidson FLH Electra Glide Base 1983
Harley Davidson FLH Electra Glide Base 1984
Harley Davidson FLHS Electra Glide Sport Base 1980
Harley Davidson FLHS Electra Glide Sport Base 1981
Harley Davidson FLHS Electra Glide Sport Base 1982
Harley Davidson FLHS Electra Glide Sport Base 1983
Harley Davidson FLHS Electra Glide Sport Base 1984
Harley Davidson FLHX Electra Glide Special Base 1984
Harley Davidson FLT Tour Glide Base 1980
Harley Davidson FLT Tour Glide Base 1981
Harley Davidson FLT Tour Glide Base 1982
Harley Davidson FLT Tour Glide Base 1983
Harley Davidson FLTC Tour Glide Classic Base 1981
Harley Davidson FXR Super Glide II Base 1982
Harley Davidson FXR Super Glide II Base 1983