I put a 195 degree t-stat in my bird the other day with a small hole drilled in it for bleeding air.
And it runs right around 190-195 as long as I'm moving but when I let it sit idleing about 5-10 min. the temp. gauge moves right on up to 220-230. I don't think it stop there if I did'nt shut the car off or drive it to get some cool air across the rad.
