Restoring a Plymouth Savoy can be very rewarding. Just keep in mind, technology has changed, so you don't have to use OEM parts. High-performance parts could actually be better for your rebuilt engine. Plymouth Savoy spark plugs from AutoAnything will definitely help your car run cleaner than OEM parts, for instance.
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First of all, car manufacturers have to cut costs and cheap spark plugs is a great way to do that. Manufacturers of Plymouth Savoy performance spark plugs need to sell their products. Therefore, they strive to make their Savoy spark plugs better than OEM!