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Knocking Help!!

  Astra VXR
Hi all not been on here for years since crashing my cup, but now have a 172.

trouble is everytime i floor it there is a terrible knocking/crunching noise:S
ive checked the engine mounts they look ok any thaughts?
or dose anyone stay near East Kilbride (Glasgow) that would take a run in it to diagnoise the problem?
all feedback welcome.