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Mast Motorsports Rectangular Port LS3 11 Degree 6-Bolt Med Bore CNC Assembled (4.000″-4.070″ Bore)

$3,599.79

Model Number: 510-303
Brands:
Mast Motorsports
  • Designed for any new Gen IV short-block with 4.000″ bore or larger
  • The 6-Bolt design is compatible with GM LSX and World LSX 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″

Each Mast Black Label cylinder head assembly includes:

  • A fully CNC machined Mast Black Label aluminum cylinder head
  • Mast micro finished .650 lift beehive valve springs
  • Mast lightweight stainless steel intake & exhaust valves
  • Mast lightweight steel retainers
  • Mast machined locks

NOTE: Gaskets, valve covers, rocker arms and pushrods not included

Flow Data w/4.070″ Bore Plate

Lift Intake Exhaust

0.100 77 56

0.200 148 118

0.300 237 165

0.400 295 208

0.500 328 227

0.600 351 235

0.700 370 241

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SKU: 510-303 Category: