Thanks for all the help. will probably use the heli coil kit part # 5523-14. Will pull the head. some other plug questions What is the difference between tapered seat and gasket type spark plugs.? Should i use anti seize on the threads or leave dry? what Gap should i use? I am using electronic ignition,orange box.If later i install a MSD ignition box/coil, would i have to change the spark plug gap?Gordy.