Nah doesn't burn any on the road. Only on the track when it's hot on the overrun.
Changed the oil before brands and the smoke wasn't noticeable from the rear view mirror.(was told small puff from friend behind) Just trying to be honest as possible about it I could have said it doesn't burn at all and sold it to someone who doesn't track, they'd be non the wiser.
I can get pics of the valve stems to show if they are leaking, haven't checked myself yet.
I've got the parts to rebuild the head but didn't bother as it's not that bad.