Irk, mind expanding on this a bit - what's an MLS gasket, and when you say you use copper do you mean a copper gasket?irk miller said:I've used all three brands with great success. There really isn't a difference material-wise in each brand gasket. Fitment from better dies seems to be what separates most of them from each other. Cometic will also do an MLS head gasket, which IMO is a better deal. I use copper on most of my bored motors, but both of my 750 choppers have the graphite Cometic head gaskets.