New cometic gas filled head gaskets.
Well I used them on a 4.00" bore, the gaskets only come in a larger size 4.135? . To make it short and sweet I blew 7 cylinders on the dyno. The tune was on. The plugs looked great! Also I was using C16! I think there is too much of a gap between the bore and the gasket. LME said they didn't like the idea, I think they were right. ALL seven of those orings were destroyed!!! They all blew in between the cylinders, where it is SOOOO thin.
I would think twice about using them. I going to try the GM MLS gaskets.
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These failed after about 8 dyno runs. I wouldn't use them again if they were FREE!


herd many things.Hopefully someone will chime in that has used em 

