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Send us your unported OEM GM-Chevy LS1 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 GM-Chevy LS1 Volume Combustion Chamber 68cc Intake Port 227cc Exhaust Port 74cc Valve Size Intake 2.020" Exhaust 1.600"  Continue Shopping  Checkout

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