Ok what can you do to a aluminum head? I cant believe I did this but when putting number 5 in it somehow got crooked and screwed up the threads. I got it to line up as close as possible in comparison to the other plugs angle wise but of course it was tight going in. What are my options, can I helicoil it with the head still on or does it have to be jerked off because of shavings? Will this cause any firing issues also?

 

You will have to ask your self these questions can you? I would pull the head

 

kd-tool makes a tap that expands and cuts from the inside-out, but i don't have any experience with it.

i'd pull the head as well.

 

Lazyness kicking in.

 

This is probably a good topic for "General F-Body Tech"......

 

I would pull the head, the last thing you need is to finish fixing the threads and then find out that you lost compression in that cyl.

 

I read a post of a guy that used that tool. Worked for him. I have seen it in a NAPA flyer. Not cheap, but if you can get to the plug hole, less work than pulling a head.