These are our brand gaskets that we have been developing for years to provide a quality product without relying on other manufacturers. We have eliminated the middleman and deal directly with the manufacturer, where we can modify, enhance, and produce the quality the end user desires. If you have any questions, please call someone on our team; we will be more than happy to assist you. These gaskets are designed to fit all LB7 Engines. An easy way to identify an LB7 engine is the location of the fuel injectors. If the fuel injectors are UNDER the valve cover, the engine is an LB7. If they go THROUGH the valve cover the engine is not an LB7 and could be located here.