Right OK
I've done at least 40,000 road miles with a Phil Joy [Protec copy] Road and Track grind
I use Protec alloy keepers and collets, I just got another set off USA ebay. I throw away the springs and use something that lasts out of a Ford pushrod 1600cc performance catalogue. They cost peanuts [at least they used to] and unlike the Protec items they don't sack.
I've never had a cam journal surface pick up, though they do get rattly, but then I change the oil often. When the bike was my sole transport I used Rock oil. I was a despatcher for a while down in the smoke and oil changes on singles were a max of 1000 miles, any make/model or they knackered.
Of course this isn't competition, and we don't have the extreme heat that some of you get, so the engines don't work so hard.
The cam I have gets rid of the dip in the powerband in mid range. Phil can still grind one up. For more top end I grind off the intake weir in the head, that doesn't have much effect on carburation
I did briefly try the cam with standard springs but got bounce. The Protec grind has a bit more lift and a lot more duration but the DR top end doesn't seem to suffer from heavier valve springs knackering the journals.
Megacyle list for this model but the exchange rate has gone back up.....
I would like to source better clutch springs. The suzie items sack pretty fast.
