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.

Installing performance Ecotec valve springs involves more than swapping springs. Learn the common mistakes involving installed height, coil bind, retainer-to-seal clearance, spring seats, rocker clearance and high-lift camshafts.

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...

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,...

Compare BK Racing, ZZP, BradBuilt, Supertech and RET Ecotec valve springs using the specifications that actually matter—including seat pressure, open pressure, mechanical lift, recommended lift and coil-bind margin.