On my 80 Malibu 4.4 (267) there is a very thin ground wire directly behind the HEI that is connected to the firewall. It is about an 1/8" width. There is another ground wire that is wider and it mounts to the back of the head on the drivers side.
Where does the other end of this very thin (1/8" wide) ground wire mount?
Where does the other end of this very thin (1/8" wide) ground wire mount?