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Load image into Gallery viewer, Piston, 90mm Flat Top for Predator 420 OHV & GX390
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Piston, 90mm Flat Top for Predator 420 OHV & GX390

  • $39.95
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Piston

90mm Flat Top for 420cc Predator/GX390

90mm Aftermarket Flat-top Piston for big bore GX390s. Fits stock bore on 420Predators (non-hemi).

GX390s Blocks can be bored to accept this piston
  • 407cc using stock crank,
  • 433 with +.160 Stroker Cranks,
  • 440cc with .200 Crank
Includes Piston & Rings

( Pin and Clips not included)

Picture for reference only, actual part may be slightly different