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A stretched timing chain on a DOHC engine will cause a retarded intake camshaft timing and a slightly retarded or normal exhaust camshaft timing. The intake cam will take most of the stretch, leaving the exhaust cam mostly normal.
The results of a retarded intake camshaft will be improved fuel economy due to less air-fuel drawn in during the intake stroke. Also, IF the exhaust camshaft is retarded from excessive timing chain stretch the result will be a lower NOX emissions due to exhaust gas being drawn in during the intake stroke, lowering the overall combustion chamber temperature.
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