I had my c 69 vet restored and finished in Sept 2010. Drove it about 100 miles since. Driving it yesterday and heard what sounded to be a hole in the muffler and sputtering. Drove another 5 moles to get closer to home at 20 mph. Drove ok but then started making more noise. Stopped and turned off everything. Checked the oil and bone dry!!! Put oil in it and sounded ok but still heard a pop. Had the engine rebuilt last year. Sounds like I screwed up as I assumed that the restorers would have put new oil in the thing. I feel so stupid. How do I know if damage was done? No oil was leaked so I didn't think that the oil was so low. Car starts and once warm makes no noise, but the occasional pop. Under air cleaner on motor appears to be a brown mark on orange paint. Got to be a bad.