Month+ old thread, I know....
My 70Z is a ~58K mile, original-build engine. Ran great for the last ten years with R45S, then switched over to 43s about a year ago. It doesnt care for those too much.
Thinking of putting some XR5s in it based on all the good reports, along with a new set of points which are probably 10 years old. Think the XR5s would be the correct plug, or should I step up/down a heat range considering it's never been rebuilt?
It'll still 4-wheel slide
, but isnt quite right at WOT
