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Pretty much out of the box on mine. Machinist check them over and said they were good to go! Over 2000 miles on them with no issues.


2K doesn't even come close to finding out if they're junk or not. Talk to me in another 48k.



Not speaking for anyone else here, but it will be AT LEAST another 20 years before my car rolls 48K miles. 20 years out of a performance part (worst case) is NOT that bad.

The aluminum that the heads are made out of doesn't know that it is 440 Source parts. Once you have them checked by a quality machinist, they are as good as anything IMHO.