Large Bore Heads (4.125"+) – Mast Motorsports
Cast | Machined | Built in the USA

Large Bore Heads

Large bore Black Label LS Cylinder Heads for 4.125" and larger bore sizes.
  • Designed for any new Gen IV short-block with 4.125" bore or larger
  • The 6-Bolt design is compatible with GM LSX, RHS & World LSX blocks
  • Has a deck thickness of .750"