Thank you so much for your reply.
I have since found the answer as I read another article about faulty cam shafts so I thought id run it past the garage.
The mechanic took the New Cam shafts out and measured them both and one was some many mm shorter than the other.
The mechanic then tried cams shafts from another Astra he had in the garage into mine and this stopped the noise !
I have now got new set of cam shafts and am very happy.
I hope that this information is useful to others.
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Wednesday, June 3rd, 2015 AT 3:39 AM