What can be the result of having the valve clearance set too tight?

Having the valve clearance set too tight can lead to increased wear in the valve train components. When the clearance is insufficient, the valves may not fully seat when closed, which restricts their ability to properly seal and can cause them to stick or fail to function correctly. This continuous friction and contact can lead to accelerated wear on the camshaft, lifters, and other valve train parts, ultimately necessitating more frequent repairs or replacements. In addition, the lack of appropriate clearance can lead to excessive heat generation in the affected components, further adding to the wear and tear.

While there may be benefits to optimal valve clearance, such as enhanced engine efficiency or power output, having it too tight specifically detracts from performance by compromising the integrity and longevity of the valve train system.