While Perkins 4.107/Westerbeke 40 engines are still widely used as auxiliary engines, the parts are drying up. But we can help. In addition to our Foley Hytork Perkins 4.107 engine parts overhaul kits; we now have head gaskets specifically for the Perkins 4.107 engine. These are quality copper gaskets from a trusted OEM manufacturer. We include them in our Perkins 4.107 engine overhaul parts kits or they are available separately for just $99.