i All, I just bought a set of NOS Champion "X" A-25 Spark Plugs to replace my aftermarkets. I was curious as to the best gap for these plugs if you can help.
I always use a thin dime.
Some like .025 and others like .030. I think any where in between will work fine.
Dave, opinions vary on this subject. I tried them right out of the box at .025 and my car ran lousy, and when i opened them up to .030 it ran great. Try them out at .025 and see what your engine likes.
Thank you all for the advice, I'll try both gaps and see how she does.
If you use a dime, it must be a genuine silver dime coined between 1908 and 1927.
Otherwise use a feeler gauge.
My rule for distributor points and spark plugs was you set the point gap with a thin dime and spark plug gap with a new dime. With modern coinage and the demise of silver coinage thin dimes are really hard to come by.
Somewhere between .025 to .030 or thereabouts.
Its kind of like a carb setting. Every T is not exactly alike when it comes to these settings.
If you look at the wax paper that your spark plug is wrapped in you will see that Champion recommends .025" gap setting. This has always worked flawlessly for me.
I guess I need to check my gaps. I have never messed with the plugs and keep blaming the timer, the coils, the carb and mixture setting for the awful running engine at high speeds
anybody got change for a dollar..... i need to gap my plugs!
Bob - Just keep your dollar$ and "plug your gaps!"