| 21. | The pistons came from Turbo II . Only 500 Chrysler TCs were produced with the DOHC 16-valve head.
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| 22. | The most popular 1600 cc engine was the Cosworth FVA, the sixteen-valve head on a four-cylinder Dino Ferrari.
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| 23. | The earlier 851 had introduced liquid cooling, computerized fuel injection and four-valve heads to the company's two cylinder motors.
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| 24. | This engine is based on the old 2-liter Mazda truck engine, with a much-updated 16-valve head and double-overhead camshafts.
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| 25. | If a valve head breaks off, it may become lodged between the piston and the head causing severe damage.
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| 26. | In the early days, Ducati reserved the desmodromic valve heads for its higher performance bikes and its race bikes.
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| 27. | Beginning with the 1978 season the 24 valve heads were banned from competition by a change to the FIA rules.
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| 28. | In 1951 AJS development engineer Ike Hatch developed a bore x stroke, three valve head version of the 7R making.
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| 29. | Type A 16-valve heads were successful in the teens, Type B was offered in 1918 and Type C 16-valve in 1923.
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| 30. | Mounting the 16-valve head on this gave a massive output, and the opportunity to make several tune-ups for the rally drivers.
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