Fk8 Tuning & Development

Creston’s Integra needed some love. K-Pro stock motor k20. X98 538whp on conservative tune.

Added a wideband, swapped the injectors and ironed out the file on the car.

Nastiest L15b7 head out there!
Micro-polished exhaust ports.
Custom Serdi machine seat cut with 30/45/60/radius intake side. Exhaust got 30/45/60/75 4 angles with wider 45 to pull heat out.

Minimal CSA targeting 660fps instead of 613fps to keep more tumble for DI. Port roof reshaped to transition into the the bowl better. Intake bowl sized to take into account the 5.5mm stem of the valve. Valve shrouding removed to increase short side airflow. Exhaust bowls increased to match the intake side increased airflow.

When porting a cylinder head, it is perfectly fine to polish the exhaust side.
The same physics do not apply. Since you are not trying to send fuel or time frequency waves, you will not need a rough texture. The finer you polish the exhaust the less heat gets transferred into the head.