It seems silly but I'm afraid to tighten more on the aluminum threads. I transferred the plugs from my stock head since they are only a few weeks old.
After warming it up with a first drive I am now wondering if I should crank the spark plugs tighter? I have a history of breaking things and hope to avoid stripping the head.
Wrap white Teflon tape or aluminum foil around the threads.
I use foil and anti seize
Chris, I would nip them up a bit more once you have run them. If the problem persists, you could try sealing the threads, but it really doesn't matter all that much.
Allan from down under.
What spark plugs do you have ??? My experience with the newer reproduction Champion X plugs is that they do have compression leaks due to bad threads.... its probably not your new head threads that are leaking.
Try older Champion X plugs, if you have access. and see if the problem still exists.
Just putting in my 2 cents in... Instead of foil wrap some steel wool around the threads of the plug.. I've used this trick many times to tighten up loose threads....and good luck
If you are not showing the T put in the 14mm adapters and use more modern plugs. That way when you remove the plugs you can leave the adapters in and not further wear out the threads.
I'm using Autolite plugs because they were the only plugs that "fit" supplied by O'Reillys that day.
I would like to consider the adapters if it won't reduce combustion efficiency by moving the electrode further away from the combustion chamber. Thoughts?
I think the threads are not compatible a different manufactured tap and spark plug die. If a matched set of tap and die were used may improve performance. A non matched pipe thread is difficult to seal and most do leak some. I had one so bad that I used resin on the thread.
I use the adapters with Champion RN14YC plugs and they work quite well with my Z head.
What size and he range of modern plugs do you recommend? Also, still a .30 gap?
Do not tighten them down in the aluminum head while it is hot from running as that greatly increases the odds of stripping the threads. My vote is to stay with real model T plugs. Heck, I can send you a set of used good champion X plugs that will work great and Look like they belong. I may be nuts but I think the T will be happiest that way, lol.
There are so many vintage plugs out there that were made for the T. It is fun to run them and the T does seem to like them. I had real good luck with many of the vintage plugs made for the model T.
I use the copper anti-seize paste on the pipe threads and tighten them down by feel. They should not leak, but like Allen said, a little leak is no big deal. I like a .025 gap on the champion X plugs. YMMV
Let me know.