For the Proton Campro CPS engine, which can be found in Preve, Exora, Suprima model, which at the car bonnet will have the CPS emblem on it, their rocker cover gasket is different from those in first generation Proton GEN2 and those later Proton BLM, and their rocker cover tightening method will involve the rocker cover bolt like in the above photo.
You can find a washer like of bush in the bolt, which normally we call it valve cover seal or may be rocker cover bush, it is interesting to find that the size of this seal is actually same with those use in Nissan old VQ series of engine, like Cefiro, Maxima, Altima and Infiniti G20, I30 and Q45.
Although for Nissan V6 engine it may need total of 20 pieces of this seal for one engine, the Proton CPS engine only need 8 pieces of it in one engine.
