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== Design ==
All three generations are [[overhead valve engine]]s, otherwise known as pushrod engines. Overhead valve engines have the valves mounted above the cylinder head, with a [[pushrod]] and [[rocker arm]] allowing a block-mounted [[camshaft]] to activate the valves. The advantages of an engine configuration like this (as opposed to an [[overhead camshaft engine]]) is that since the camshaft is located within the engine valley, a pushrod engine will be shorter in height compared an overhead camshaft engine.<ref>{{Cite web |last=Silvestro |first=Brian |date=2018-04-25 |title=Why Pushrod Engines Have a Low Redline |url=https://www.roadandtrack.com/car-culture/car-design/a20062169/why-pushrod-engines-cant-rev-high/ |access-date=2023-03-21 |website=Road & Track |language=en-US |archive-date=July 27, 2023 |archive-url=https://web.archive.org/web/20230727171228/https://www.roadandtrack.com/car-culture/car-design/a20062169/why-pushrod-engines-cant-rev-high/ |url-status=live }}</ref> Another advantage is that there are fewer mechanical components such as [[timing chain]]s and extra camshafts, which increases reliability by keeping the engine simple.<ref name=":5">{{Cite web |last=Webster |first=Larry |date=2004-05-01 |title=The Pushrod Engine Finally Gets its Due |url=https://www.caranddriver.com/features/a15132711/the-pushrod-engine-finally-gets-its-due/ |access-date=2023-03-21 |website=Car and Driver |language=en-us |archive-date=April 2, 2023 |archive-url=https://web.archive.org/web/20230402020945/https://www.caranddriver.com/features/a15132711/the-pushrod-engine-finally-gets-its-due/ |url-status=live }}</ref>
[[File:Pushrod2.PNG|thumb|A [[pushrod]] configuration that would typically be found in a LS-based [[overhead valve]] small-block. Lobes of a rotating [[camshaft]] transmit upward motion through [[valve lifter]]s to pushrods, which open valves via downward motion transferred to them by a [[rocker arm]].]]
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