What is a characteristic of Multi-Layer Steel (MLS) head gaskets?

Multi-Layer Steel (MLS) head gaskets are designed to offer superior sealing capabilities, particularly in high-pressure environments, making them ideal for performance applications such as turbocharged engines. The construction of MLS gaskets typically consists of multiple layers of steel, which allows them to conform better to irregular surfaces and maintain a strong seal under the stress of high pressure and temperature. This characteristic is essential for preventing head gasket failure, which is a common issue in high-performance or modified engines.

In contrast, MLS gaskets do not necessarily require a rough surface to seal properly; they can often seal well on both smooth and rough surfaces due to their design. Additionally, while composite gaskets can be more durable in certain applications, MLS gaskets are commonly chosen for their ability to withstand extreme conditions. Flathead engines, which are an older engine design, may not typically utilize MLS gaskets as a first choice because these engines generally do not operate under the same high-pressure conditions where MLS gaskets excel.