Oh yes, earplugs! Get the ones that have cords attached to them so that you can get them out easy.
A 3 angle valve grand is when they take the valve out, clean it up and make sure that the outer ring is perfectly true. Often times the edges of a valve will be pitted and covered in carbon. In order to insure that the valve seals up properly they will 'sharpen' it.
Shimming the car is similar to doing valve lash. Underneath the lobes of your cams are shims. These shims vary in thickness and are designed to allow a certain tolerance between cam lobs (this is where feeler gauges come in). The problem when getting your head totally rebuilt is that all of your shims need to be re-calibrated to proper spacing. At about 8 bucks a pop and 24 in a car, it can get expensive and is time consuming. A machine shop should have them in stock of all sorts of thicknesses and they'll just swap out as they need.
A 3 angle valve grand is when they take the valve out, clean it up and make sure that the outer ring is perfectly true. Often times the edges of a valve will be pitted and covered in carbon. In order to insure that the valve seals up properly they will 'sharpen' it.
Shimming the car is similar to doing valve lash. Underneath the lobes of your cams are shims. These shims vary in thickness and are designed to allow a certain tolerance between cam lobs (this is where feeler gauges come in). The problem when getting your head totally rebuilt is that all of your shims need to be re-calibrated to proper spacing. At about 8 bucks a pop and 24 in a car, it can get expensive and is time consuming. A machine shop should have them in stock of all sorts of thicknesses and they'll just swap out as they need.
