| O-ringing the block serves as a positive seal to the cylinder head. The failure that most will state is that the headgasket spits out prematurely. The issue is that when you run an O-ringed block you MUST receiver grove the cyilnder heads to match the O-rings bore dimension. This is EXTREMELY important to have done. You can not use just any head gasket either. A one off copper head gasket has to be made so that once the cylinder head is tq'd down properly the copper is forced into the receiver groove in the head thus creating that positive seal. In all honesty the individuals making 800+rwhp should really think about getting this form of machining done as it has a better success rate on sealing combustion. Headgaskets (Tomei in particular) have a sealed fire ring with a raised boss around the bore that semi acts as an O-ring which makes for a better head gasket to use. Right now I have an engine on the stand that I'm debating on doing this to as its up to the customer ultimately in what he wants to do. We are aiming for 1500HP if any of you guys are wondering. I hope that helps answer your questions. If you have any further questions please feel free to email me and I can do my best to help you out as best as possible.
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