These stroker pistons are designed to be used in conjunction with S&S 4-5/8" stroke flywheels to convert 1000cc ironhead engines in 1972-' 85 Harley-Davidson® Sportster® models to 1200cc (74")) displacement. They can also be used to replace pistons in older stroker engines with 4-1/16", 4-9/16", 4-1/2", and 4-13/16 stroke flywheels. All clearances must be checked. These pistons are normally used in stock Harley-Davidson® cylinders. No cylinders are available from S&S for ironhead Sportster models. 3-3/16" bore, +.030" overbore.
