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Re: valve guides
They are what holds the valve in place. If you didn't have valve guides, the valves would just flop around in a big hole. Massive vacuum leaks, oil burning and pretty severe damage would occur without them.
They ARE the hole into which the valve fits. Without them, there is nothing to keep the valve in place.
Valve guide is to valve as cylinder is to piston.
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Dragging people kicking and screaming into the enlightenment.
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