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Global West highly recommends linear rate springs (also known as constant rate) over variable; not that variable rate springs are bad, but linear rate springs provide the best performance for our customers. Here are reasons why we prefer linear rate verses variable:Consistency As a linear is compressed, the resistance increases per inch equal to that of the rate. For example, if a spring is rated at 300 pounds per inch, for every inch of travel the spring compresses, the resistance increases 300 pounds. Therefore, one-inch of compression will provide 300 pounds of resistance, two-inches 600 pounds, and three-inch 900 pounds. Variable rate springs, however, do not increase in the same fashion. The are generally rated with a lower spring rate on initial, and build to the desired rate. Example: The first one-inch of travel might start out as 250 pounds per inch, the second-inch 560, and the third 900. For a driver who is looking to improve their driving skills, a vehicle must give predictable feed-back each time during cornering and trail braking. A linear spring will do that because the rate is consistent.Less chance of bottoming-Lowered cars always have reduced suspension travel. The lower you go the less travel is available. Variable rate springs tend to allow more travel before the spring can build rate, keeping the suspension from bottoming. The question is: Is there enough suspension travel available while the spring builds enough resistance (rate) before bottoming occurs?Variable rate springs tend to over emphasize the geometry curve giving us more tire movement than necessary.Chassis diagnostics is difficult.Lowered SpringsOur springs generally lower the vehicle one-inch in the front and up to 1-1/4 inches in the rear depending on the option for your vehicle. Why we only lower about one-inch in the front is simple, there is not enough suspension travel beyond one-inch for street applications. We admit, vehicles lowered one-inch look great, but they generally run into suspension bottoming problems. Header to ground clearances tend to be another issue. Therefore, in our experience, we believe one-inch makes the most sense especially if the care is driven on the street.Superior Quality 1964-1967 GM A-Body 1 Drop Front Coil Springs for Big Block EnginesWhen it comes to enhancing the performance of your classic 1964-1967 GM A-Body vehicle, Global Wests 1 Drop Front Coil Springs (Big Block) Part Number: S-5 is a top-tier choice. Designed with precision and crafted from the highest quality materials, these springs offer a significant upgrade to your vehicles suspension system. Our springs are engineered to provide consistent resistance, reducing the chance of bottoming and ensuring a smoother, more controlled ride. This is particularly beneficial for A-Body vehicles such as the Buick Skylark, GS, Special, Grand Sport, and Sport Wagon models.At Global West, we understand that installing new suspension components can be a daunting task, especially for first-time restorers. Thats why we provide comprehensive DIY instructions and video tutorials to guide you through the process. Our step-by-step guides are designed to make installation as straightforward as possible, ensuring you get the most out of your new suspension components. And if you ever run into any issues, our dedicated customer support team is always on hand to assist you.But we dont stop at providing top-notch products and support. We also offer a range of related products to further enhance your classic cars performance. Check out ourBuick Parts Onlinefor a wide selection of quality components. If youre specifically looking for parts for your Buick Skylark, ourBuick Skylark Partscategory has you covered. And for a comprehensive upgrade to your suspension system, dont miss ourBuick Skylark Suspensioncategory. With Global West, youre always one step closer to the perfect ride.