Project Do It All S13, Assembling the Bulletproof SR20DET Cylinder Head!

We are using 1mm larger valves and the valve seats were opened up with a Newen CNC valve seat-cutting machine.  The Newen cuts a smooth continuous radius from the chamber to the seat and then from the seat to the valve bowl to give the ultimate in low lift flow.

We used a Supertech 1mm oversize intake valve, the intake valve is made out of nitrided stainless.

The valve’s nitrided finish is hard, slippery, and wear-resistant which ensures a long life.  We WPC treated the valves for longer life and smoother operation as well.

The intake valve has a reduced diameter stem and a nail head contour that improves flow for flow coming into the cylinder.

We used Supertech Inconel exhaust valves with a sodium-filled stem.  The Inconel resists the high temperatures that a turbo generates while the sodium helps conduct heat away from the valve head.  This actually can give more detonation resistance.  The valves are 1mm bigger than stock and have a reduced diameter stem with a tulip contour to help flow.

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