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R33 Series 2 1997 RB25DET Rattle from cold coming from top end. Doesn't reduce, as it gets warmer. Never run for more than a minute as it sounds scary. Oil Cap off whilst running has no oil sloshing or splashing inside. Cam lobe on show is almost dry Oil Pressure on guage seems to stay a little elevated Normal Service History and Oil/Filter changes Oil is a little dark but not too bad Noise all of a sudden came on according to Driver Car has now been parked gathering dust 160k on odometer. Blocked Oil Feed Galleries? Is there a screen filter installed somewhere in the head/block or into camshaft followers ? Where does the oil enter the Camshafts Any ideas... apart from Oil Flush and Change. Is there something that could be blocking the oil access to the top of the head ? Very perplexing...