[Tony Radford]

J.P.,

Your situation sounds interesting (in an unfortunate sort of way). I'm running an unstroked Windsor and the temp is extremely stable. I run mine pretty hard and the temp remains constant regardless of whether I'm idling or screaming through the gears. I recently installed a 16" Spal puller fan that I'm running on a thermostat though it ran pretty cool with the 12" is was running before. I would be inclined to agree with a water pump problem, a slipping fan belt or something simple.