[wildfire8]

I was testing a grill / bumper block using painters tape. I taped my whole front up covering all the holes. I left a small square hole for some air to still cool the radiator. Was driving on the free way and the temps started jumping up and down. My needle usually sits just under half temp and it was jumping up to almost max temp. On my scan gauge with out the block temps are around 183F+/-. With the block the max temp hit 213F. I want to keep an block on there but I am worried about my engine getting damaged to over heating. What is a safe temp range to look for with a block on and not hurting the engine?