For OEM quality without the OEM price, pick up a piston kit from Drag Specialties for your 17-20 107-in. M-Eight. The cast aluminum alloy pistons feature a coating that extends life and reduces friction so your engine can run cooler. Pistons are available in standard size and up to +0.20” overbore and provide a 10:1 compression ratio. Kits include wrist pins and clips. They accept OEM or Hastings rings (available separately).
Suggested retail is $115.95.
Link: Drag Specialties