Thanks for the replies,
Its the M57 engine, I don't have it fully stripped down yet however, 1 of the exhaust camshaft bearing caps & 6 rockers are broken, I removed both camshafts & performed a cylinder leak down test, amazingly every cylinder holds pressure!!
I'm still going to remove the cylinder head when I get a minute.
Ive just checked Realoem, that will be very useful thanks
