another question from me. i have noticed the threads in the spark plug holes aren't great some will have to be repaired. could someone tell me the spark plug thread size.
12mm x 1.25 pitch https://www.ngk.com/product.aspx?zpid=9696
I'd suggest using and actual insert rather than a helicoil since these are threads that are regularly used. Helicoils are ok for rarely used threads, one time assembly stuff
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