HEMIENVY -- Where and how did you do your research? The 17059 (marine applications) and the 8519 (truck block) have simple flat folded over cylinder armors that should not brinell at all. The other two gaskets -- 1009 and 1039 -- are both "Performance" gaskets which have an internal pre-flattened soft wire ring with a stainless steel folded-over armor. The pre-flattening of the wire ring reduces any brinelling (as compared to earlier designs that were not pre-flattened), however, if it does have any, its actually better for combustion sealing, especially in higher CR applications.

I'm former Fel-Pro applications engineer and am well aware of the designs.