JG71B
Well-Known Member
Looking for opinions on the appearance of this plug (all 8 look about the same). Bone stock 77 400 4bbl, 1406 carb with stock rods and jets, Weiand intake, stock electronic ignition with an orange box and headers. Initial timing 15* btdc and 34 or so total and using 89 or 90 non ethanol. Thanks!