Economical Kit That Produces Significantly More HP Than the Stock Rod and Piston. Uses Special Long Rod and Custom Flat-Top Piston So That It Fits a Stock Bore in a GX390 Without Any Machining or Boring.

Forged Wiseco 2-Ring Flat-Top and Long Billet Rod Combo. Drop-In Kit, No Cutting or Honing Required.

Forged Wiseco Flat-Top and Long Billet Rod Combo. Drop-In Kit, No Honing or Cutting Required.

Forged Wiseco 2-Ring Flat-Top and Long Billet Rod Combo. Drop-In Kit, No Cutting or Honing Required.

Forged Wiseco 3-Ring Flat-Top and Long Billet Rod Combo. Drop-In Kit, No Cutting or Honing Required.

Forged Wiseco 3-Ring Flat-Top Piston and Long Billet Rod Combo. Drop-In Kit, No Cutting or Honing Required.

Forged Wiseco 3-Ring Flat-Top and Long Billet Rod Combo. Drop-In Kit, No Cutting or Honing Required.

90mm Forged Wiseco Flat-Top and Long Billet Rod Combo. Drop-In Kit, No Cutting or Honing Required.

Forged Wiseco Flat-Top and Long Billet Rod Combo. Drop-In Kit, No Cutting or Honing Required.