Thanks everyone.Johnny, I actually read that thread late last night, too bad there wasn't a follow up. I've used those plugs before, not for anything like this though. Im not sure if one of that diameter would be short enough to squeeze between the head and crossover, then add the height of the bolt, I'm not optimistic. Plus, how long do you think the rubber would last in extreme temperatures? 15 degrees on a winter day, then sitting in 230 degree coolant in a matter of minutes, then back again. Sounds rough for $2.00 rubber plug, I don't want to have to replace it every year or two. Plus I'm tired of working on the cooling system, in the past year I've replaced the water pump, thermostat, surge tank and radiator (all ac delco), I don't want to see or smell coolant for the next 10 years.
The other thing is, I don't like to half ass anything, even on an old beater, let alone my own car that I rely on every day. My Seville only has 72,000 miles on it and is in great shape, id rather do it right.
Ok I went outside to look, there's no way I'm fitting my hand down in between there, the gap is too narrow and the hole is too far down. I'd love to just take it to the dealer and have them deal with it, but I just bought and installed struts, strut mounts and spring isolators on all 4 corners, so I'm a bit low on funds.
If I end up doing this myself (most likely) does anyone have any tips or guidance? I already have plenty of tools and have learned many "magic words" over the years. Thanks again.