GM LS3 CNC SQUARE PORT Cylinder Heads, 276CC RUNNER Bare Pair (CNC ported in Australia)

LS3 CNC Ported Rectanlge Port Cylinder Heads, Pair New Cylinder heads,

*NO Exchange required*

DRP-LS3-276CNC Rectanble CNC Ports Specifications:

• Rectanlge Port Intake: 276cc CNC Ported Runner
• Valve Guides: Premium Bronze Valve Guides. (Factory OD)
• Material: Hard 356 Aluminium -  Race Quality.
• Valve Seats: 3 Angle Valve Seats - CNC machined - ready to assemlbe
• Intake Port Volume:    276cc - CNC ported
• Exhaust port Volume: 92cc - CNC ported
• Intake Valve size:  2.165"     (Factory size)
• Exhaust Valve size:  1.600"   (Factory size)
• Combustion Chamber:  68cc  *tested with DRP valve Dish - can vary depending on dish of valves (take 025" off to get 65cc with DRP valves)
• Combusiton Chamber CNC: NO - we have kept this as cast to keep compression 
• Valve Angle:  15 deg (Factory Angle)
• Min bore diameter:  4.000"   *not suitable for LS1 blocks with the smaller bore
• Intake port location: stock
• Exhaust port location: stock

Flow Figures: 4.000" Bore @28"