lre makes billet cylinders to. Not sure how they hold up or anything like that but i have had good luck with his work so far!

i really like the athena cylinder.

I've had two ice cubes go out of round on me personally. Both were on stroker motors. One long rod and one short rod. One was a 101 and the other a 100. The 100 lasted a few races. The 101 lasted two weekends. I have since switched to the sparks cylinders. Well worth the money.