A camshaft (10) is formed from a plurality of individual chill cast cams (12) and an elongated shaft (24). Each cam (12) has a hole (20) therethrough which has a groove (22) in its surface at a predetermined angular position. The shaft (24) has a plurality of cam receiving portions (24a) thereon which are spaced along the shaft and each have an outer peripheral surface (26) which is a close fit in the hole (20) in one of the cams (12). The outer peripheral surface (26) has a groove (28) therein at a predetermined angular position. The grooves (22,28) cooperate in forming a passage (30) which receives a wedge member (32) to hold the cam (12) in a fixed orientation relative to the shaft (24).

Bearings having an overlay (14) deposited by cathodic sputtering. In one example the overlay comprises an aluminum matrix (22) containing a dispersed phase (24) of tin. The overlay may contain a relatively low content of tin adjacent the interface (18) with the substrate (10;12) rising to a relatively high content at the surface. The surface may comprise a layer (26) of substantially pure tin to act as a sacrificial overlay during initial running of the bearing.