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As you're building additional power and boost in your diesel truck, its common to install head studs in order to keep the head(s) in place to avoid a blown head gasket. Well, sometimes merely installing head studs still isn't enough and it requires installing fire rings into the head to really keep all of that compression in place. While this does require machining, if you're building a performance engine, its a necessity and ATS Diesel Performance offers complete fire ring kits for numerous applications.