if i was changing the sump gasket id get a new sump for £30. my old driver used to tap like mad from cold. rev'd it hard and it was ok for a while. the Hydraulic tappets were at fault, either get a new set or get some wynnes hydraulic tappet fluid oil addative depending how bad the noise is.
i put enough wynns hydraulic tappet fluid into my old 1992 bmw 325 worked a treat, and definatly cheaper than 24 tappets. i put enough additive for 12L of engine oil about twice the reccomended amount, purred like a kitten after that lol
