Mast: LS3 280cc 4.125 Cylinder Heads [Camaro Corvette CTS V, LS3 LSA]

Mast Motorsports


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 A head that truly has no competition.  The Mast LS3 280 head was designed for customers with big bore LS engines that wanted to run LS3 intakes or superchargers.  This head is very capable when paired with the proper intake and displacement and has supported over 900hp on pump gas with a Whipple 2.9L consistently.

Heads come standard with PAC 1207X Double Springs for boosted applications; however, if you want the N/A PAC 1204X Beehive Springs, specify in the order notes.  Listing also includes the GM rocker arm mounts.
  • Utilizes the Gen IV LS7 OEM rockers, but accepts the LS3/L76 intake manifold
  • Designed for any new Gen IV short-block with 4.125" bore or larger
  • The 6-bolt design is compatible with GM LSX and RHS Blocks
  • Uses a 2.200" intake valve and 1.600" exhaust valve
  • 12 Degree Valve angle
  • Has a 280cc intake port
  • Has a deck thickness of .750"
  • 70cc Combustion Chamber Standard
  • Cast & Machined in the USA!

Flow Data w/4.125" Bore Plate
Lift Intake Exhaust
0.100 78 65
0.200 162 118
0.300 243 171
0.400 304 212
0.500 347 229
0.550 362  
0.600 376 245
0.650 384 247
0.700 390 249

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