Medium Bore Heads (4.000"+) – Mast Motorsports
Cast | Machined | Built in the USA

Medium Bore Heads

Medium bore Black Label LS Cylinder Heads for 4.000" and larger bore sizes.  
  • Designed for any new Gen IV 6.0L or 6.2L engine including LS3, L99, L92, L76, LY6, LSA, and LS9
  • Perfect for LS1 / LS6 stroked short blocks
  • Has a deck thickness of .750"