Spark plug gap should be .020 .025 .030 .035? I have been told all of the above. What is correct?
Try them all and stick with the gap that makes your car run the best!
I forgot to mention - my new Champion X plugs came pre-gapped at 0.025 inch (I checked them all before installing them), so I installed them that way and my car runs fine with them. I was too lazy to try other gaps to see if they would be better.
It takes more energy from the ignition system to force the spark across a wider gap, making for a "hotter" spark. However, if the ignition system cannot provide that higher energy, the plug will misfire and performance will suffer. The only way to find the "best" gap for your car is to experiment.
Mark thanks for the info, mine came with .035 gap I will try that and will respond with my results.
Don't let Dean Yoder gap your spark plugs! If you don't believe me look at the thread where he is gaping the spark plugs on Rob's car!
If you want to keep it factory correct, the manual says "1/32" or the width of a well-worn dime" But if you don't care about authenticity, you can set it wherever you want.
(Sorry, I couldn't resist)
All cars are different. But the manual does state that they are to run at 1/32" regardless of what Champion says.
My car will not run smoothly at .025
My original ignition cars like .030 and my distributor cars (I know !) like .035.
Yeah, but your distributor cars really don't really give a dang how many thousandths crankshaft end play you have!