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MAST Motorsports Large Bore Rectangular Port 280cc LS3 12-Degree Bare CNC Head

$1,399.99

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  • 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 World LSX blocks
  • Uses a 2.200" intake valve and 1.600" exhaust valve
  • Has a 270cc intake port
  • Has a deck thickness of .750"

LS3 12 Degree 4.125"-4.200" Large Bore CNC (70cc)



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  • Model: 510-204
  • FROM: MAST Motorsports

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we added this on Tuesday 24 March, 2009.

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