Hey Old, I have Kats block heaters in all my trucks Blazers and even my 4 hole Saturn. My Ns have had L/rad. hose heaters and one has a head to block Kats. You said that a block heater would not, and no way fit in an N. Well you could have knocked me over with a feather, I never gave it much thought when I looked for one and no can find.Is it because of the length of the heating element and the water jacket is too narrow? Or freeze plug locations? I did find Kats 28mm screw in that has an internal element if ya wanted to tap low in the block, but I wont be the one to experiment on. So did you find out the hard way that a freeze plug block heater wont work on an N? Thanks for the heads up.