A car owner dreads the news that they must face a head gasket job on their Geo head gasket. If they ask a dealership to do the job, the repair bill can be staggering. A savvy and patient DIY mechanic can handle the job, with patience and attention to detail. The easiest part of a head gasket job is ordering a new set from our site. You'll be guaranteed high-quality head gaskets that can stand up to the constant heat and friction in the combustion system. The key to a good head gasket job is ensuring that the head gaskets will seal properly for the rest of the life of the engine. To do that, the surface of the head and block must be completely flat, and the roughness of the finish should be within manual specifications. If there is any gap between the gasket and the head and block, the seal will be broken. The gasket will also suffer from friction because of the tremendous pressures it withstands; that friction will shorten the lifespan of the gasket. Your Geo manual will use the Ra (roughness average) measurement to calculate with the finish of the surface is smooth enough. The head must the straightened, aligned and then resurfaced if needed to make it reach the specs. Following these specs, and checking and doublechecking your measurements is laborious and detailed work, but will ensure that your Geo head gasket will last a long time.