![]() ![]() Modifications to the head were thereby reduced as the Jet Valve negated the necessity for a three-valve-per-cylinder design. The for the intake valve were widened on the valve end to accommodate the cartridge, which was equipped with a very soft valve spring in order to avoid wear on the camshaft intake lobe. ![]() It was designed as a cartridge containing the valve spring and seat which simply screwed into a threaded hole in the head, similar to a but inside the cam cover. This valve induced swirl in the intake charge, enabling the use of leaner fuel/air mixtures for lower emissions. United States passenger car versions had a small secondary intake valve referred to as the 'Jet Valve'.
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