3-1/2" +.020", 80" LC Forged Pistons for 1978-'84 HD® OHV Engines 7" headlights harley new 6 piston differential bore

new 6 piston differential bore caliper for 18 inch diameter rotors is the first direct bolt on

mounts sold separately for Indian Motorcycle applications

Engine features 4-5/8" stroke X 4-1/8" bore at 10

5 wheel requires a triple tree rake equivalent to what would typically be used on the traditional 23 x 3

3-1/2" +.020", 80" LC Forged Pistons for 1978-'84 HD® OHV Engines 7" headlights harley new 6 piston differential boreThese 3 1 2" +. 020" 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,