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DOHC/OHC: Valve Train Construction
DOHC stands for, “Double Overhead Camshaft,” while OHC means, “Overhead Camshaft.” Both are simple terms describing the construction of the valve train. The double overhead camshaft is not a standard of the industry. In fact, they were rare in the classic muscle car days.
Most engines had a single overhead camshaft or camshaft in the engine block like the famous small-block Chevrolet V8. However, some manufacturers experimented with DOHC layouts for added performance and revving capacity.