.528/.557 Purple shaft solid spring pressures.

Not a SB, but as to Mopar's recc'd. springs, a guy working in parts at the dealer had raced His Omni with the biggest cam back in the early '90's. He had all the stuff from the catalog, long tip followers retainer/spring pkg. etc., couldn't keep it from kicking out rockers....went to the next cam down & lived with it. Basically those used SB springs at that level, I'd have been curious to see what it took to solve that issue, just more spring load or was it a dynamics issue.....