- 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
- These pistons are normally used in stock HD® cylinders, and must be purchased separately, based on the required piston oversize
S&S Cycle high-compression stroker piston set, part number 106-5778, features a 3-7/16-inch bore with a +.050-inch oversize and is designed for use with S&S stroker flywheels in 1936–1984 Harley-Davidson big twin applications. The pistons may be used with 4-1/2-inch, 4-5/8-inch, and 4-3/4-inch stroke flywheels for listed displacements of 84, 86, and 88 cubic inches, respectively.
With a 4-1/2-inch stroke, the combination is listed at 84 cubic inches and 8.4:1 compression; with a 4-5/8-inch stroke, it is listed at 86 cubic inches and 9.4:1 compression; and with a 4-3/4-inch stroke, it is listed at 88 cubic inches and 10.8:1 compression. Modern piston alloys and advanced skirt profiles allow tighter fitting, supporting reduced engine noise and long engine life.
These pistons are normally used in stock Harley-Davidson cylinders. The required piston oversize must be selected based on the cylinder application. Listed fitment includes 1941–1945 Harley-Davidson EL and FL models. Manufacturer part number: 106-5778. Vendor part number: 106-5778.
Features:
- Brand: S&S Cycle
- Manufacturer Part Number: 106-5778
- Vendor Part Number: 106-5778
- Bore: 3-7/16 inches with +.050-inch oversize
- Application: S&S stock bore stroker kit for 1936–1984 Harley-Davidson big twins
- Stroker Compatibility: Designed for use with S&S stroker flywheels measuring 4-1/2, 4-5/8, or 4-3/4 inches in stroke
- Listed Displacements: 84, 86, or 88 cubic inches depending on stroke
- Listed Compression Ratios: 8.4:1, 9.4:1, or 10.8:1 depending on stroke
- Cylinder Use: Normally used in stock Harley-Davidson cylinders
- Fitment: 1941–1945 Harley-Davidson EL and FL models
Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Regular Stock: false
Units Per Sku: 1
Fitment:
1941 Harley Davidson EL Base
1941 Harley Davidson FL Base
1942 Harley Davidson EL Base
1942 Harley Davidson FL Base
1943 Harley Davidson EL Base
1943 Harley Davidson FL Base
1944 Harley Davidson EL Base
1944 Harley Davidson FL Base
1945 Harley Davidson EL Base
1945 Harley Davidson FL Base
1946 Harley Davidson EL Base
1946 Harley Davidson FL Base
1947 Harley Davidson EL Base
1947 Harley Davidson FL Base
1948 Harley Davidson FL Base
1949 Harley Davidson FL Base
1950 Harley Davidson FL Base
1951 Harley Davidson FL Base
1952 Harley Davidson FL Base
1953 Harley Davidson FL Base
1953 Harley Davidson FLF Base
1954 Harley Davidson FL Base
1955 Harley Davidson FL Base
1955 Harley Davidson FLF Base
1955 Harley Davidson FLH Hydra-Glide Base
1955 Harley Davidson FLHF Base
1956 Harley Davidson FL Base
1956 Harley Davidson FLF Base
1956 Harley Davidson FLH Hydra-Glide Base
1956 Harley Davidson FLHF Base
1957 Harley Davidson FL Base
1957 Harley Davidson FLF Base
1957 Harley Davidson FLH Hydra-Glide Base
1957 Harley Davidson FLHF Base
1958 Harley Davidson FL Base
1958 Harley Davidson FLF Base
1958 Harley Davidson FLH Duo-Glide Base
1958 Harley Davidson FLHF Base
1959 Harley Davidson FL Base
1959 Harley Davidson FLF Base
1959 Harley Davidson FLH Duo-Glide Base
1959 Harley Davidson FLHF Base
1960 Harley Davidson FL Base
1961 Harley Davidson FL Base
1962 Harley Davidson FL Base
1970 Harley Davidson FLH Electra Glide Base
1971 Harley Davidson FLH Electra Glide Base
1971 Harley Davidson FX Super Glide Base
1972 Harley Davidson FLH Electra Glide Base
1972 Harley Davidson FX Super Glide Base
1973 Harley Davidson FLH Electra Glide Base
1973 Harley Davidson FX Super Glide Base
1974 Harley Davidson FLH Electra Glide Base
1974 Harley Davidson FX Super Glide Base
1975 Harley Davidson FLH Electra Glide Base
1975 Harley Davidson FX Super Glide Base
1976 Harley Davidson FLH Electra Glide Base
1976 Harley Davidson FX Super Glide Base
1977 Harley Davidson FLH Electra Glide Base
1977 Harley Davidson FX Super Glide Base
1978 Harley Davidson FLH Electra Glide Base
1978 Harley Davidson FX Super Glide Base