Thanks for the info. I pulled one and that is what I thought. But the 1 1/2" plugs i have I can't even get to start. I have a pretty straight shot at it but no go. I thought they may be a slightly smaller mm size and that is why i am having so much trouble. Afton.
Thats what i did. But to get it out I had to distort it a bit so thought I would double check. Its been a long time since i replace any of these while the engine was still in. Almost forgot how much fun it is.