This is kind of what I was going to say.

It seems with a little milling on some heads you can get tons of compresison.

And for what its worth, I just used a set of mahles for the first time in a stroker and was very impressed with what I saw, very light, very affordable (comes with rings for less than others did without) hard anodized over entir piston and teflon anti friction coating on the skirts....

I am building a 410 for my 99 RT dak and trying to figure out how to not end up with 12 to 1.