LS1 225cc 3.890"+ | Single CNC Cylinder Head

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  • Regular price $ 1,425.00
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Mast Motorsports LS1 225 Cathedral Port heads are designed for getting the most out of your LS1 or LS2 engine.  If you are looking to make more power with your stock bottom end LS, you have found the right head.

With supporting upgrades this head will support 500hp on a 5.7L LS1.   


  • 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 LS1 / LS6 stroked short blocks
  • Available as packages for LS3 Camaro, Corvette, L99 Camaro, & L76 Pontiac G8
  • Accepts Gen IV LS3 valvetrain, valves, & Cathedral Intake manifolds
  • Uses a 2.080" intake valve and 1.570" exhaust valve
  • 11 Degree Valve angle
  • Has a 225cc intake port
  • Has a 69cc combustion chamber standard
  • Has a deck thickness of .750"
  • Cast & Machined in the USA!
Flow Data w/4.000" Bore Plate
Lift Intake Exhaust
0.050 37.6
30.3
0.100
75.6
59.2
0.200
134.1 105.9
0.300
200.5
144.1
0.400
252
192.2
0.450
275.9
205.1
0.500
296.7
215.9
0.550
311.3
224.2
0.600 321.2 229.3
0.650 329.4 232.9
0.700 338.4 237.0
0.750 347.1 241.1
0.800 350.3 245.6
0.850 332.4 248.4

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