S&S Cycle 106-5521 3-1/2",+.020", 80" HC Forged Pistons for 1978-'84 HD® OHV Engines Buckle See Dealer for details

See Dealer for details

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S&S Cycle 106-5555

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S&S Cycle 106-5521 3-1/2",+.020", 80" HC Forged Pistons for 1978-'84 HD® OHV Engines Buckle See Dealer for detailsS&S Cycle 106 5521 These 3 1 2" +. 020" 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