see, 630 on a t4 35R on a B or H series, 646 on a K isnt that far fetched. The most they ever took that motor to was 7k, b/c it is a stock accord bottom end.

Hell daniel made 630whp in 3rd gear with his t3 35R and that was a 3rd gear pull, 4th probably would have netted at least 10 more whp. He still has timing that he can add as well.