cylinder head specialist Kevin Troutman of KT Engine Development saw the telltale signs of classic valve float. The racer either didn't notice or just didn't bother to mention the problem to KT ...

Why do we use nested or beehive valve springs? When is it best to use pushrod valve actuation or DOHC shim-under-bucket tappets or finger followers? Should we drive cams with gears, chains ...

and/or a loss of engine valve control leading to valve float. Neither outcome is pleasant as an overheated engine may result in expensive repairs or blow the engine completely, while valve float ...

This may seem like a problem only for drag racers spinning stratospheric-rpm small-blocks, but this situation applies even to everyday street engines. Valve float and loss of valve control can ...

solid lifters reduce the chance of float. VALVE TIMING (green) Overlap (when both intake and exhaust valves are open) helps engines breathe at high rpm. The downside: Overlap can cause a rough ...

Jason Fenske of Engineering Explained is here to help us understand why we can't push a pushrod engine to higher rpm limits. It comes down to valve float, which is when the pushrod assembly begins ...

With engine speeds so much higher than they used ... the valves on the chassis dyno,"says Katech's Jason Harding. "Valve float kills the power, which is pretty much a [known] fact, but it's ...