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Send us your unported OEM Cadillac Northstar cylinder head to have it professionally CNC Ported in-house by Direct Motion Motorsports on the Rottler P55, our revolutionary 5 Axis CNC Cylinder Head Porting Machine. About how the Direct Motion Motorsports process works Photos of 5 axis cnc ported heads This head is flow tested on a Superflow SF600 at 28 inches with a 1/2 inch radius intake plate and a short stack exhaust tube. Please check back soon for actual flow numbers of our CNC Ported OEM Cadillac Northstar Volume Combustion Chamber Intake Port Exhaust Port Valve Size Intake Exhaust  Continue Shopping  Checkout

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