Bear_Gibson
Senior Member
- Joined
- Feb 10, 2016
- Posts
- 195
- Reaction score
- 28
- Location
- Cape Girardeau, MO
- Ram Year
- 1999
- Engine
- 5.9 magnum
My misfire was a burned #1 exhaust valve. The reason the heads cracked is usually because the plenum leaked oil into the combustion chambers. This would clog the cat which is right below the right side head. The heat from the cat can cause the head to crack. I relocated mine further back and used a magnaflow y pipe in place of the stock converter.I am now reading stuff where these magnum heads crack very often. So.... that would suck. Would that cause a misfire? How common is this?
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