Engine Building

Answers to common GM Ecotec valve spring questions covering pressure, installed height, spring rate, coil bind, maximum lift, RPM, camshafts, valve float, retainers and high-performance valvetrain setup.

See how BK Racing evaluates Ecotec valve springs using installed height, seat pressure, open pressure, spring rate, coil bind and mechanical lift—and why testing the complete valvetrain matters for high-RPM...

The BK Racing Ecotec valve spring system goes beyond spring pressure. Learn how our 83 lb springs, titanium retainers, extra-clearance seats, valve seals and lash-control components work together for high-lift,...

Why did BK Racing develop an 83 lb Ecotec valve spring instead of simply chasing more seat pressure? Learn how high RPM, aggressive cams, open pressure, spring rate, lift margin...

Which valve springs does your GM Ecotec actually need? Learn how camshaft lift, RPM, boost, valvetrain mass and racing duty cycle determine the correct spring for street, performance and racing...

Is a 94 lb Ecotec valve spring automatically better than an 83 lb spring? No. Learn why seat pressure alone cannot determine spring capability and how open pressure, spring rate,...