106-5554 | 31/2" Bore Forged Stroker Piston Kits For Stock Heads Or S&S Performance Replacement Heads - STD backpack usb Measures approximately 20"W x 9"H

Measures approximately 20"W x 9"H x 10"D

For an extra daring touch

Chrome: 18-213-1C

For all '99 and earlier Harley-Davidson models with integrated taillight assembly

Deep Cut® Fork Boots

106-5554 | 31/2" Bore Forged Stroker Piston Kits For Stock Heads Or S&S Performance Replacement Heads - STD backpack usb Measures approximately 20"W x 9"HS&S Cycle 106 5554 These forged 3 1 2" bore stroker pistons for 1984 '99 HD Evolution big twin engines are required for the S&S 89" stock bore stroker kits, which include S&S 4 5 8" stroke flywheels. Pistons are designed to be used with stock cylinder heads or with S&S Performance Replacement heads. Low silicon forged material and advanced S&S piston skirt design result in high strengh and low noise. 3 1 2" standard bore. Install Instructions Download