managed to source out new head bolt to replace the the block heater which does double duty as the center bottom head bolt on the left hand cylinder head.. It is difficult to torque properly and with global warming probably not required any longer.
(will post picture of this block heater element which extends deep into block and and down to the oil in the pan.)
(will post picture of this block heater element which extends deep into block and and down to the oil in the pan.)