Harlon sharp roller rockers

532#'s open is well within the range of Harland's. You either have a float problem or bind, I'd think. I've not done much with A engines, so I don't know sustained rpm effects the 59* valvetrain. I know harmonics is a big issue with the NASCAR teams and we all know they manage to go 600 miles, @ 9000 plus revs with flat tappet stuff!