Difference with spark plugs

[Ian Williams]

I guess Bob it could be your terminology, a seven in good condition will not burn a pint of oil in 300 miles, (well mine don't) however some might leak that much oil if not put together well (again mine don't) If your car with late head was not burning oil but still fouling plugs you would have without doubt had one or more of the following issues; Incorrect timing, the wrong grade plugs fitted and or over rich mixture. Get these all these right and with good bores a Ruby head is completely trouble free in my experience.