i bought 2 cars 89 convertible 5.0 rs stik that for 1500 the next for 780 i wanted to do some routine work i have no idea what im doing so i change the thermastat to start im taking off second nut for housing and the bolt snapped leaving a knub sticking out the block so i drilled it and got a reverse drill bit and started cranking that and then that snapped of inside then my crazy friend descided to try to get under the easy out with the drill and now im wondering of 3 quarters of an inch would be to big to bore out thermastat housing AND THE 780 CAR is a 88 rs 2.8 i just dont have the money to have the shop do it