The add makes them sound fantastic, but I have to agree with the others on this one , I spent about $4500 on my 440 and the last thing I want is to loose it to a my-nute piece of debris entering my combustion chamber, possibly damaging a valve, seat, or even piston top. $ 4500 don't sound like a lot, but I'ze po folk and its quite a bit of hard earned cash for myself !I'll stick with the stock gaskets ! :undercar: