If you can, I would recommend O��ringing the block and using copper head gaskets.

IMHO, the main concern cutting the O��ring receiver grove the head and using wireloc head gaskets is the receiver grove width and depth must be just right, if the depth is too deep, then it��s like running regular head gaskets.

Now, using copper head gaskets with a O��ring'd block crushes the O��ring into the gasket and makes a better seal then the wireloc head gasket setup IMO.

However, if you��re fuel/air mixture and NOS setup is on the money I don��t think you would have a problem no matter what setup you use. I��ve only run a max of 150 shot, so I really can��t say about the 200 shot. But the only time I��ve blown head gaskets is when I��ve leaned it out... my fault.

For precisely this reason, some of the big boost turbo guys prefer not o-ringing the heads. They see the headgaskets as a fuse. Usually when a headgasket goes it's because something is wrong with the tune. Better to pop a gasket than to hole a piston or pound out the bearings under detonation.