Originally Posted by
G-Magoo
Little known fact is the factory heads were not actually torqued down enough, and Toyota, knowing about this never corrected the issue or issued a recall. Torquing the head bolts down to 75ft.lb. or so remedies most of the HG issues.
btw, this "little known fact" has been widely known for ~20 years. it was well doccumented on the old geopages, yahoo pages, sonic, etc.... and is still well doccumented on every supra forum and then some. guess you dont read about toyotas much.