OK when pulling spark plugs one was not coming out easy. Then when I tried to put a new one back no go. I was freaking out thinking the head was coming off no matter what.
Power Built 14mm x 1.25 back tap. Sounds dumb if you ask me but I was desperately needing an answer so I ordered one. I used assembly lube and threaded from the inside out about 4 times by hand. I cleaned the tap out after every pass with carb cleaner. Then the last two passes it was fully expanded with anti- seize. The new spark plug went in easy by hand and I feel that there's plenty of threads. Edelbrock performer heads.

Anyway I feel this is a good cheap tool.

 

Oh yeah also I think all the debris came out in the lube instead of into the motor.

 

If you have further problems Use a timecert and locktite. Grease the tap and drill.

 

I like to use Anti-Seize.... But thats just my 2 cents....
https://www.permatex.com/products/lu...e-lubricant-2/

 

Slick *****, bahahahahahaha

 

haha, oh boy.