Ferrari 355 Spider, I have recently had a major belt service. After about 800 miles my car developed this noise at the rear left side front of the engine. At first I thought it was and maybe it is a bearing. Dropping petrol tank to investigate. Has anyone experienced any rubbing at the front of the engine on the fiberglass petrol tank protector shield? The clearance is very tight between the belts and shield in my opinion. Car has new water pump, alternator Hills bearings. I have used a stethoscope and i think the noise emanates from the fiberglass tank shield. Any thought or input appreciated.