1) Pistons with offset pins installed backwards will clatter like a diesel on cold startup until reaching operating temp.
2) Rods hung backwards will seize on the crankshaft or spin bearings as the crank fillet wedges the connecting rod cap up.
3) Running the car in an enclosed garage with duct hose exiting outside the garage directs all the exhaust sound away from the car
and you hear mechanical noises that were there all along but couldn't hear over the normal exhaust.
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Triple Black 1971 GTO
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