GENERAL INSTRUCTIONS These instructions are designed to give some basic information and things that you need to be aware of when attempting to install a camshaft in many overhead camshaft (OHC) and pushrod engines. For specific information and details on each individual engine and car combination, we recommend purchasing an owners repair manual, i.e., Haynes, Motor, Chilton, or the factory service manual. We recommend reading all of the general instructions, and depending on the type of engine, OHC or pushrod, read all available information pertaining to your type engine. CYLINDER HEAD BOLTS AND PUSHRODS Some OHC and pushrod engines like the Toyota 20-22R, Mazda (Ford Courier), and MG have their head bolts also holding down the rocker arm assembly. This means that the head bolts must be removed in order to access the valve train and remove the cam. Before loosening the head bolts, let the engine stand overnight. The cylinder head can easily warp if bolts are removed when the engine is hot or even warm. If you are working on an OHC engine that already has a warped head and you are going to try and get its surfaced, keep in mind that if the head surface is warped the cam bearing bores must also be warped, and in some cases this cannot be repaired. When removing the head bolts, loosen from the outside in. Loosen in small increments. When re-torquing, tighten from the inside out in small increments. The torque sequence and recommended specs are found in your repair manual.