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.

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.

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.

Learn how GM Ecotec valve springs control the valves, roller finger followers and high-RPM valvetrain, and how spring pressure, installed height, camshaft lift, spring rate and coil bind affect performance.

Thinking about cutting your Ecotec balance shafts? Learn how cut balance shafts compare to Short Chain Balance Shaft Deletes, why racing changes the equation, and why BK Racing focuses on...