Blowing white smoke and oil out exhaust

I have a VT 5L it is blowing white smoke and oil out exhaust. It had valve seals replaced, it has has poor compression in cylinder seven. It never got hot it is not losing water, the oil is down from full to add I can see where the oils coming out on the extractors where they meet up with the high flow cat on the driver's side. It has no knocks part from its oil and smoke issue and compression issue. It sounds like a good car and it was always looked after serviced every 10,000 ks.