Re: Spark Plugs

Posted by PackardV8 On 2011/9/7 18:30:56

According to my AC spark plug book dated 1976:

55-56 V8 7/16" reach 43LS or 3/4" reach R45XLS or 3/4" 45XLS.

Personal note: on the 43LS listed above i would definately move up at least one heat range to 44LS.