Cruise Seems Lean
The later 70's, mine is 1978, some of the RV heads have added cooling passages in them. They cast a bump in the head to ensure people use the correct spark plug. They are the smaller 5/8" socket taper seal peanut plugs. Just an example below for 440 engine. Looks like an Autolite 85 will work also.
The later 70's, mine is 1978, some of the RV heads have added cooling passages in them. They cast a bump in the head to ensure people use the correct spark plug. They are the smaller 5/8" socket taper seal peanut plugs. Just an example below for 440 engine. Looks like an Autolite 85 will work also.
