What does the overhead cam do for a 93 ford crown Victoria?
A 1993 Ford Crown Victoria uses a pushrod engine, not an overhead cam (OHC) engine. Therefore, it doesn't *have* an overhead cam to do anything.
Pushrod engines have camshafts located low in the engine block, which operate the valves via pushrods and rocker arms. Overhead cam engines have the camshafts located in the cylinder head, directly actuating the valves.