I must admit to have heard lots of suggestions about what to use when assembling an engine, but I think that there may well be more than one to use, depending on which area of the engine that is being put together. When I first started to rip engines apart & reassemble them, I always used engine oil. But as I got into bigger more expensive engines like the 750 & 1000 Exup engines, I found that I needed something a bit more substantial. When installing valves into guides for example, engine oil would tend to be wiped off. So I have used Bel-Ray assembly lube (with molylube). This is exactly the same as the Rocol ASP or anti-scuffing paste that I used to use on radio & radar components & it lasted well. But when I used this on my 750 cam bearings, I found that it was a bit too heavy, & the stuff ended up in the sump plate as a gooey mess. So I asked around & ended up using some stuff called Lubriplate #105 white grease from the USA. This I use on cam bearings & followers, big & main bearings.
