I've found a compression leak in one of my cylinders, so its off with the headgaskets (after loss of lots of coolant). I called the timesert 800 number to get prices, and the lady quoted me $370 for a set of ten, so I'm assuming that I need two sets since there are 20 head bolts. Also, after the head gasket job is finished, how reliable is the engine after that, I've heard stories about cracked blocks after headgasket replacements. Its a 96 eldorado. Another question, I have the pc0717 code (speed input sensor for the tranny), so with both of the heads off, would it be very accessable to open up the side of the transmission for this sensor replacement?