This is with the stock height covers, right??? Just looked over a pair of the Topline heads that a friend bought... They have had lots of port and flow bench time on them...didn't hear the flow numbers... Anyway, the runners and chambers NOW look great, but the outside is still a bit less then show car stuff... These heads are for a competitor's car, so I'll let ya know how the performance is in a month or so when drag racing starts...