It is best to do this one plug, and one lead at a time, this will keep the firing order correct. Take the lead off a plug, remove the plug with a plug key or socket, then attach a new plug to a piece of tubing, and present the plug to the threaded hole. If you inadvertantly screw the plug in on the wrong thread, the tubing will turn on the head of the plug, and will not damage the thread. Turn the plug back out and try again. Be sure to get the plug alligned properly otherwise damage to the thread will occur. Now replace the lead to the distributer, or dispac, and connect to the new plug. Do the next plug and lead as above.
aranger
August 2010