Discussion
Which component seals a spark plug into the cylinder head?
Answer: B
Flat seat plugs use a captive crush washer while taper seat plugs seal on the cone and need none. Fitting a washered plug where a taper is required, or the reverse, changes the reach and can wreck the engine. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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