S&S Cycle 79-84 BT 3-1/2in +.030in 80in LC Forged Pistons

These 3-1/2" +.030" bore pistons fit 1979-'84 80" HD® big twin engines, producing 8:1 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).

Designed specifically for 1979 to 1984 Harley Davidson Big Twin engines, the S&S Cycle Part Number SSC106-5514 forged pistons offer reliable performance and durability. These pistons feature a 3-1/2 inch bore with a +0.030 inch oversize and an 8:1 compression ratio, optimized for use with stock unmodified cylinder heads. Constructed from modern alloys and utilizing advanced skirt profiles, these pistons are designed to fit tighter tolerances which help reduce engine noise and extend engine life. Historically, such performance gains were only achievable with weaker cast pistons, but S&S Cycle’s forged design ensures enhanced strength and longevity for your engine. They are suitable for a range of Harley Davidson models including the Electra Glide, FLHS Sport, Tour Glide, and FXR Super Glide II, making them a versatile upgrade to improve engine efficiency and performance. These pistons are intended for installation by qualified technicians and are compatible with existing cylinders when purchased separately. Please note that they are not carburetor approved but require acknowledgment of this during installation. These high-quality pistons are a critical component for enthusiasts seeking to restore or upgrade their Harley Davidson Big Twin engines with precision-fit forged parts that deliver consistent performance over time.

Features:

• Designed for 1979-1984 Harley Davidson Big Twin engines, ensuring a perfect fit

• 3-1/2 inch bore with +0.030 inch oversize for increased displacement

• Constructed from modern alloys with advanced skirt profiles for tighter fit and reduced noise

• Achieves 8:1 compression ratio with stock unmodified cylinder heads

• Compatible with a range of Harley models including Electra Glide, FLHS, FLT, and FXR Super Glide II

• Forged construction provides enhanced strength and durability for long-term engine performance

• Fits existing cylinders when purchased separately, ideal for engine rebuilds and upgrades

• Requires professional installation and acknowledgment of non-carb approval status

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