Wiseco K631M875 Forged Piston Kit (4) for 02-08 Honda/Acura K-Series (K20/K24)

Vehicle Fitment

• Honda/Acura K20 engine block (K20A, K20A2, K20Z1, K20Z3)
• Honda/Acura K24 block with K20 cylinder head (K24/K20 hybrid)
  
  
• K20 apps:
  2002-2006 Acura RSX Type-S
  2002-2005 Honda Civic Si
  
  
• K24 apps:
  2003-2007 Honda Accord
  2004-2008 Acura TSX
  2002-2006 Honda CR-V

Fitment Notes

• 87.50mm bore -- requires boring/honing from stock
• K24 block w/ K20 head: 11.18:1 CR / 152mm rod
• K20 block: 9.82:1 CR / 139mm rod
• Verify stroke, rod length, and CR before ordering
• Not California emissions legal
• Professional engine building required
• Set of 4

Features

• Wiseco Sport Compact series
• 2618 aerospace forged aluminum
• ArmorGlide skirt coating
• Flat top crown (-3.4cc)
• K20/K24 valve pockets
• Strutted forging design
• Performance ring set included
• Made in USA

Specifications

• Part Number: K631M875
• Series: Sport Compact
• Bore: 87.50mm (3.445 in.)
• Compression Height: 30mm (1.181 in.)
• Crown: Flat top, -3.4cc
• Wrist Pin: 22mm
• Material: 2618 Forged Aluminum
• Skirt Coating: ArmorGlide
• K20 Block: Stroke 86mm / Rod 139mm / CR 9.82:1
• K24 Block (K20 head): Stroke 99mm / Rod 152mm / CR 11.18:1
• Quantity: Set of 4
• UPC: 193564077448
• Country of Origin: USA

Included Components

• 4x forged 2618 pistons
• 4x performance ring sets
• 4x 22mm wrist pins
• Wrist pin locks

Product Description

The Wiseco K631M875 is a Sport Compact 87.5mm forged piston kit for Honda/Acura K20 and K24 engine applications. The flat top -3.4cc crown and 30mm compression height make this kit compatible with both the K20 block and the K24 block with K20 head -- a popular build combining the K24's longer stroke with the K20's superior head flow. CR and rod length differ by config: K20 block = 9.82:1 / 139mm rod; K24 block with K20 head = 11.18:1 / 152mm rod. Verify your engine combination before ordering.

2618 aerospace alloy delivers superior fatigue resistance for forced induction and high-compression builds. ArmorGlide coating reduces friction and improves cold-start durability. Performance ring set, 22mm wrist pins, and locks included. Requires boring and honing -- professional engine building required. Not California emissions legal. Set of 4. Made in USA.