3-1/2" +.020", 80" LC Forged Pistons for 1978-'84 HD® OHV Engines 7" headlights harley 4 axes CNC Machined from

4 axes CNC Machined from billet aluminum or brass

Race-inspired design

mounts sold separately for Indian Motorcycle applications

5" square and

FTI41-FB+1-AS Length excluding threads (2

3-1/2" +.020", 80" LC Forged Pistons for 1978-'84 HD® OHV Engines 7" headlights harley 4 axes CNC Machined fromThese 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,