Increase the displacement of 883cc and 1200cc engines to 1250cc at 10.3:1 compression
Cast Flat-Topped Replacement Piston Kits For 1984-'99 HD® Big Twins with Stock Heads or S&S Performance Replacement Heads
May be used with stock 1200cc cylinder heads, but S&S CNC ported heads are recommended
Stock 1200cc cylinders and 1986-'2003 883cc cylinders may be bored to accept the 3-9/16" bore 1250cc pistons, but 2004-'16 883cc cylinders may not be used
