Ok so I was at the local HD dealership today, MAYBE looking at a muscle vrod, but anyway, was looking at a fat bob and the salesman was saying that to get more compression i.e. power you can replace the head gaskets with thinner ones. Stock is .0080 and going with a .0040 gives the motor more compression. I'm not exactly clueless in the motor department, but I've never heard of something like this. Is this BS or is there something there?