Carla's '52 Chevy pickup was not running right. We hooked up a vacuum gauge to diagnose the problem. The reading on the gauge indicated a problem with the valves. Remove the valve cover and find that 3 pushrods have been bent! We suspect that because the pickup has been sitting idle for so long the gas has turned to varnish causing a couple of the valves to become stuck in the the valve guides, thus bending the pushrods.
A vacuum gauge is an incredibly useful tool that can be used to diagnose anything from this old '52 chevy pickup to a 2010 Camaro. Here is a cool website that explains how to use a vacuum gauge, it also includes some very useful animations
http://www.secondchancegarage.com/public/186.cfm
Here are Jeremy and Shane cleaning and inspecting the rocker arm shafts off the '52.
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