DRAG SPECIALTIES Replacement Piston — 3.498" bore, +0.020" oversize, 4-1/4" stroke, pair – 79-84 Big Twin, 80-84 Touring, 82-84 FXR, 84 Police
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OEM-quality cast aluminum pistons; kits include two pistons, wrist pins and clips. Accepts OEM or Hastings rings (sold separately).