Well I know you can of course remove the valve springs and then release and rotate the rocker covers, but I wanted to check out the state of play after 2000 miles, and hopefully address those pesky oil leaks !! Good job I did as I found one inlet valve guide had become loose and more or less fell out of the head !! Bores and pistons perfect - so now I can put it back together and probably create some new oil leaks in the process !!