Engine Building

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.

Does your Ecotec need cylinder-head modifications for upgraded valve springs? Learn the difference between drop-in and modified spring systems and when machining, retainers, seals, or spring-seat changes are actually necessary.

Does a performance Ecotec really need dual valve springs? Learn how single and dual springs compare in pressure, spring rate, lift, dynamic control, installation and high-RPM performance.

Camshaft duration and maximum lift do not tell the whole story. Learn how aggressive Ecotec cam lobes increase valve acceleration, spring demand and high-RPM valvetrain requirements.

More camshaft lift increases Ecotec valve spring compression and open pressure while reducing mechanical clearance. Learn how lift affects coil bind, retainer-to-seal clearance and spring selection.

Matching Ecotec valve springs to camshafts requires more than comparing maximum lift. Learn how cam profile, RPM, spring pressure, spring rate, valvetrain mass and mechanical clearance determine the correct combination.