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Message: [QUOTE="borsky, post: 1246891, member: 8126"] In the article you posted, it says "in street uses there is generally only a groove machined in the head". This pertains to street usage. Most competition Fire rings have grooves machined in both the block and the head. These are the ones that is not recommended for street use. The "fire rings" you are using are somewhat of a hybrid version.(little bit of both). And yes i have Zero personal experience with fire rings. The topic of fire rings vs o-rings has been discussed on here and other forums many times and the biggest misunderstanding is what the definition of each is... This is also the case here. The OP was asking if there was longevity issues with orings, and I replied that what he confusing the issue with issues associated with True competion fire rings. And u stepped in with your "expertise" on fire rings and claimed there was no such issue with fire rings. And i think this could mislead the OP. So to be clear, it is not recommended to run true fire ringed setups with both grooves machined in the heads and the block in DD setups due to failures associated with heat cycling. The cheaper and most proven setup for DD's is o-rings. Another option for possibly a little better sealing for more money is the "hybrid" version that hypermax offers, This version uses a groove in the head but relies on the ring as the actual seal, where the o-rings use the stock gaskets to seal the combustion chamber and simply provide more clamping around the chamber. IMO o-rings are the most proven method, some like stroking6L have had good luck with the hypermax setup. but others like charlie have not. (charlie's was an experimental version) It is also my opinion that for the backyard mechanic the orings are the more fool proof option. I'm sure there are less install related issues for obvious reasons. Also would like to add that anyone that does use o-rings themselves i would recommend a retourque after sitting overnight to let the orings settle into the gaskets. I was able to achieve a significant amount of movement in the nuts in the morning [/QUOTE]