Originally Posted by mjr46
25's should be the right plugs for pedastal mount heads........headers may be making it tough to get a straight shot with the correct plug..meaning 25's not 605's
When I put the 605 back in and it went straight in with no problem. Tried with the 25 for 10 minutes and could not even get it started. According to auto lite's website both plugs are threaded the same but yet the 25 will not thread in. I'm wondering if it has something to do with the threads being shorter? Maybe it is bottoming out before it gets to the threads?