here we go again,seems to take for ever for oil to reach the rockers,(oil coming out of tube)oil pressure light goes out straight after starting,one lifter is very noisy untill oil arrives at the top end,no other rattles or noises,I've also got oiling problems when hot,very smokey after engine stood for a few moments,hazey there after,i've got the head off again to get the guides checked..head is very damp in 3&4 head bores and oily around 4,5,6 valve guides. so it looks like new guides for that but i'm stumped for the first one,am I right in saying oil for the top end comes from the centre bearing,so any problems here will cause trouble up above,what would a worn oil pump cause where can i get a new one??I thought these were a straight foreward engine,simple etc but this one's realy trying me patience,maybe I should have got someone else to rebuild it.