Ecotec Exhaust & Airflow

Compare OEM, Ferrea, Supertech and BK Racing Ecotec exhaust valves by size, material, geometry and available flow-bench data. See what each manufacturer publishes, what the testing actually shows, and why...

Build a high-RPM Ecotec valvetrain as a complete system. Learn how valve springs, exhaust valves, lightweight retainers, solid lash and camshaft geometry work together for reliable valve control in racing...

Can an undercut valve stem improve Ecotec exhaust flow? Learn how exposed stem area affects airflow, why stem-to-head transition matters and how BK Racing uses undercut stem geometry as part...

How much RPM can a stock Ecotec valvetrain handle? Learn what happens to exhaust valves, springs and valvetrain control at sustained high RPM—and why circle-track racing places very different demands...

Why does exhaust valve shape affect airflow? Learn how tulip shape, back-cut, margin, stem design and transitions influence Ecotec exhaust flow—and why two valves with similar diameters can perform differently...

Do performance Ecotec exhaust valves actually increase airflow? See what BK Racing learned from back-to-back flow-bench testing, including how an intentionally undersized development valve gained 3 CFM over the stock...