| 31. | A common upgrade for a crossflow head engine is to use 351 Cleveland roller tip rocker arms.
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| 32. | It replaced the standard pullrods with rocker arms that activated vertical coil springs mounted behind the gearbox.
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| 33. | The primary rocker arm contains the VTEC switching piston, while the secondary rocker arm contains the return spring.
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| 34. | Depending on the design used, the valves are actuated directly by a rocker arm, finger, or bucket tappet.
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| 35. | The primary rocker arm contains the VTEC switching piston, while the secondary rocker arm contains the return spring.
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| 36. | The F7502 was central to the success of the L20, though it suffered from repeated rocker arm failures.
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| 37. | The suspension was designed around a series of rocker arms instead of the usual set up of wishbones.
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| 38. | The shovel engine does not have covers, per se, but rocker boxes and rocker arms which pivot on shafts.
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| 39. | Like all other Harley Davidson engines, the Shovelheads use pushrods to raise the rocker arms and open the valves.
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| 40. | VTEC is a complex system of camshafts and rocker arms that actually change cam-lobe profile as engine revs climb.
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