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I was yesterday eveneing visting at my buddy's garage after he had found some metal particles from used oil when he had changed the motor oil. Found out that problem was caused by broken valve guides and pulled the heads up from the engine.

Find enclosed a picture from broken guides. There was 4 broken guides. Asked from my buddy had he checked the valve guide clearances before installation? Answer was no.

Has anyone else had similar problems with these heads and have you used some standard replacement guides or specially machined to fit the Source heads?

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Looking at your picture it almost looks like the wrong shims were used while setting your valve spring pressure. The guides are cut from the outside in. Every source head I have taken apart have single springs and locator cups.