The casting number on my heads is 6272292. I looked at the kb icons but I only see a .180 dome and would only give about 8.3 to 1. I would really like 9.5 to 9.8 to 1 whick I can get with the speed pro L2328nf. They have a .319 dome. Do you think just grinding bigger seats will last long term vs the hardened seats. Which is your prefered roller rocker you use?

Thanks for all your advice, Wes