| 31. | By the mid-1990s, the spin valve head using an exchange-bias layer was well on its way to displacing the AMR head.
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| 32. | It had a single overhead cam and eight-valve head, and was fitted to Civics in all markets aside from North America.
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| 33. | Most road cars used an 8-valve engine, though five Type 13 racers had 16-valve heads, one of the first ever produced.
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| 34. | The first idea of using a 2.0-litre engine and then using the 16-valve head from Cosworth simply did not give enough power.
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| 35. | A destroked FE at 77mm, the F8 comes in several configurations including a 12-valve head and fuel injection later in its life.
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| 36. | The 350X featured a 26-horsepower air and oil cooled 350 cc four-stroke engine with a 4-valve head; impressive technology for the time.
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| 37. | It solved the power dilemma by borrowing superbike technology and giving the YZ a five-valve head, liquid cooling and a 12.5-1 compression ratio.
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| 38. | The 3.6 was the first AJ6 engine, debuting in 1983 on the XJ-S . It had DOHC 4-valve heads with a bore and stroke.
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| 39. | It was quite advanced in some ways, using hydraulic disc brakes both at the front and back as well as a 6 valve head.
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| 40. | Capable of 70 mph, the four-valve head allowed more efficient gas flow and the spark plug could be positioned in the middle for optimum combustion.
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