O-Ring vs. Fire Ring
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Like stated for a competition rig then yes, but a DD that sees lots of heat cycles some last and some don't.
#10
Just my 2 cents.... I would run fire rings thats what I had done to mine, I talked to alot of shops out here and they said there the only way to go, Just make sure the first month or so take it kinda easy and re-torque the head a couple times hot and a couple times cold then you should be golden after that.