DRAG SPECIALTIES Replacement Piston — Bore oversize +0.030 in, Piston diameter 3.528 in, Stroke 4.25 in – 79-84 Big Twin, 80-84 Touring, 82-84 FXR, 84 Police
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OEM-quality cast aluminum construction; kits include two pistons, wrist pins and clips; accepts OEM or Hastings rings (sold separately).