LS1 245 cc 4.000"+ CNC Cylinder Head

  • Sale
  • $ 999.99
  • Regular price $ 1,249.99


Looking to step up your LS2 engine to the next level?  Mast Motorsports has what you need.  Our LS1 245 Cathedral Port heads are designed to work well with your stock displacement but thrive with stroker kits or boost.  If you want the most out of your LS Engine look no further!

  • Mast Rocker Stands required to run factory LS3 rocker arms
  • Designed for any new Gen IV 6.0L or 6.2L engine including LS3, L99, L92, L76, LY6, LSA, and LS9
  • Perfect for LS2 stroked short blocks
  • Accepts Gen IV LS3 valvetrain, valves, & Cathedral Intake manifolds
  • Uses a 2.165" intake valve and 1.600" exhaust valve
  • 11 Degree Valve angle
  • Has a 245cc intake port
  • Free Drop .226" Intake and .255" Exhaust
  • Has a 70cc combustion chamber standard
  • Has a deck thickness of .750"
  • Cast & Machined in the USA!
Flow Data w/4.065" Bore Plate
Lift Intake Exhaust
0.050 39.6 28.8
0.100 74.5 54.7
0.200 142.1 103.4
0.300 208.5 142.8
0.400 271.1 189.6
0.450 296.6 206.1
0.500 318.8 219.0
0.550 335.2 228.5
0.600 351.4 235.4
0.650 363.2 240.7
0.700 372.2 245.1
0.800 351 253.7