Small Bore Heads (3.890"+) – Mast Motorsports

Small Bore Heads

Small bore Black Label cylinder heads for 3.890" 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"