one or more fastening bosses 14 and one or more compression bosses 16 may assist in securing and or attaching the engine front cover 10 to the engine 12 the fastening bosses 14 may mate with corresponding receiving apertures 32 as one example a threaded bolt such as fastener 34 may be inserted into the fastening boss 14 and mate with a threaded portion of the receiving aperture 32 other fasteners are available as the fastener 34 mates with the receiving aperture 32 the compression bosses 16 may contact receiving surfaces of the engine 12 such as receiving surface 28 and receiving surface 30 dimensional configurations of the compression bosses 16 and the respective surfaces 28 and 30 may create compressive forces in the compression bosses 16 once the fastener 34 is secured force arrows 36 show these compressive forces at the contact between the compression bosses 16 and the respective receiving surfaces 28 and 30 as such dimensional configurations for compression bosses and opposing surfaces may combine with fastening bosses to create interference at the contact regions and thus create compressive forces examples of dimensional configurations may include machined tolerance conditions and or stacks to ensure that compressive loading and or a positive clamp load may occur under various operating conditions the interference may be calculated based on manufacturing and machining characteristics of the mating components additionally and or optionally a tolerance stack may be used to ensure that compressive loads between the engine front cover 10 and engine 12 are maintained under various stacked conditions for example high and low dimensions on each of the mating components may be examined to insure an interference occurs in accordance with the manufacturing and machining characteristics as mentioned above available space in an engine environment is often.