MAST Motorsports Medium Bore Rectangular Port 255cc LS3 11-Degree Bare CNC 6-Bolt Head

• Designed for any new Gen IV 6.0L or 6.2L engine
• Including LS3, L99, L92, L76, LY6, LSA and LS9
• Available as packages for LS3 Camaro, Corvette, L99 Camaro & L76 Pontiac G8
  
• The 6-Bolt design is compatible with GM LSX, LS Next and RHS blocks
• Accepts Gen IV LS3 valvetrain and intake manifolds.
• Uses a 2.165" intake valve and 1.600" exhaust valve
• Has a 256cc intake port
• Has a 69cc combustion chamber standard
• Has a deck thickness of .750"

LS3 11 Degree 4.000"-4.070" 6-Bolt 255cc Med Bore CNC (69cc)