MAST LS3 Cylinder Heads - Large Bore 4.125+

Mast Motorsports

$3,495.00

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•  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
•  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
For boosted setups, we recommend the hollow intake and inconel exhaust valves for an extra $199 total.  If using LS rockes, you'll need to add the stands for $99 as well.
 
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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