i was gonna say that comp controled chevys program is set to run its best at 210 degrees but your last post reminded me that your not comp controlled but up to 220 is liveable for moderate periods of cruising-- i have a friend with 89 gta having same go around with 160 tstat --only problem i really see with that low tstat is the f- bodies rad is not that big and coolant doesnt stay in rad long enough to cool down to regulate temps----------- also is your lower air dam still in place in front-- its all that directs air up thru the radiator