This 6 pack of MSD Ignition Iridium 3720 Spark Plugs is a great choice for anyone looking to improve their vehicle's performance. These spark plugs are designed for gasoline engines and are compatible with the Buick Grand National model. The MSD brand is known for their high-quality products, and these spark plugs are no exception. They are easy to install and have a long-lasting design, ensuring that you can rely on them for a long time. These spark plugs are perfect for anyone who wants to improve their vehicle's acceleration and fuel efficiency. So, if you're looking to upgrade your Buick Grand National's ignition system, these MSD Ignition Iridium 3720 Spark Plugs are an excellent choice.