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360beast · May 19th, 2022, 10:00

As the others have said it is very common on these cylinder heads and is nothing to worry about. I had a patch like that on my 531 head still after I got it skimmed and it has been absolutely fine for about 10k miles now.

May 19th, 2022, 10:00	#6
360beast Go redblock or go home Last Online: Today 08:13 Join Date: Feb 2012 Location: UK	As the others have said it is very common on these cylinder heads and is nothing to worry about. I had a patch like that on my 531 head still after I got it skimmed and it has been absolutely fine for about 10k miles now.