Hello,
How do you Engineers fit spark plugs in Aluminum cylinder heads? Do you thread the head and fit the plug, or fit a bronze insert in the head to make it more reliable and a better life?
Thanks in Advance for any replies,
Colin
Hello Colin!
I have made a few models and some have there fair share of "miles on them and I have never had a problem with threads in aluminum. My heads are 6061 aluminum and not some exotic species. The plugs in the V8 are #8-40 and no trouble. Tap the aluminum, you will be fine.
1/4-32
#8-40