Just a problem to avoid if you utilize one of these heads due to my lack of observation. I just finished replacing a fully functional head at 190k miles to try to prevent any valve issues. I also had vm specialists put in all new valves .
When I put coolant back in it flowed out of two threaded ports that I had failed to compare to the removed head . I then removed the two threaded bolts with copper washers from the removed head and put them in the replacement head which cured the problem. I just never knew the threaded ports were connected to coolant system until I already had a big mess to clean up and more work to reach them under intake side of valve cover to put them in than if done before placing head on block.
I would suppose these ports are intended to be used for a block heating system access
_________________ 05 Blu LIM, OME GDE Tbo, wk II 245/75/17, KC Lights, bull bar, 195K H TC 05 Blu Lim, Dayton, GDE HT, 255/75/18 , 210K , H TC 06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC 06 D Khaki Lim 126K wkII Eur TC 05 D khaki Lim 145k refurbishing All CRDS: Fumoto, Lift , Fan Shroud mod, fuel head Gen II, SAMCOS,self TB, 2 Mic filt, Hayden
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