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Originally Posted by 351wStang
Ok, now that we know its been rebuilt this changes a few things. Did he rebuild it himself or was it professionally done? At first I was thinking he may just be hearing spark knock/light detonation. But if its a hollow knock for sure it could be a more serious problem. I doubt however that its "piston slap" because he should hear that all the time. It comes from a broken piston skirt. It could be a wrist pin but he should also hear that more than just when he gets on it hard. If he can verify that it is only a problem when he is running it hard then I doubt its anything in the shortblock. He may just have a loose follower. How long ago was it rebuilt? How many miles since the rebuild?
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Im not sure how long its been rebuilt. I think its been almost half a yr now. And he had it pro rebuild, he said he had alum headers and blocks put on bigger cam. I personaly have not heard the knock, Im just telling you what he told me. The knock has only been going on for the last 3 days he says. He also says he can only hear it when his window is down. He cant hear it with his window up. And as far as I no he said its a hollow knock. What if its a soild knock? What could be the problem then?