got all my plugs changed but one. Broke the last one taking it out, but eventually got it out alright. went to put the new plug in and it wont tighten at all. The old plug, well whats left tightens just fine. Hoping it isn't stripped.

Grabbed some more plugs hoping the threads on the new plug could be the issue, but still no go. Any ideas?

 

Did you check the plugs to see if you are installing the correct plugs? If you have the correct plugs, then i would say the hole has striped threads. You maybe able to repair the spark plug hole with a heilcoil kit.

 

Yup, running the same champion plugs throughout without issue, so unless for some crazy reason there was a different plug, looks like I'm sol and gonna have to try and repair it

 

Can I run the Autolite 5224s in the 4.7, or should I run the Champions?

 

I would use champions.

 

Damn...i'll have to exchange them. Is there that much of a difference between them?