...maybe AFR got their **** together with the SBF stuff. This has been several years ago, but I bolted a set of AFR 185s down to a 331 stroker and with a mild Comp cam, it floated the valves anywhere north of about 5800. These heads were brand spanking new, OOTB, untouched. We had to pull the heads for an unrelated issue and the machine shop discovered they needed to be shaved .008" and the springs were too weak because AFR liked to use heavy valves. Both the shop owner and their head machinist said they'd seen at least 6 sets come in over that past year for the same thing. They both agreed the castings were great and the CNC program clearly worked, but when you put heavy valves with roller lifters over .500" lift, their springs fell woefully short of the requirements...and pretty much any decent SBF roller cam was over .500" lift and .230* @ 050"...the fact they needed to be shaved to clean up was just an isolated incident, but it only underscores the need to take even quality heads to a trusted machinist to verify everything.
just my .02...