Where would oil contamination come from to destroy a new 331 short block at 500 miles. Broken piston rings, damaged cylinder walls, wrist pins. Followed guidelines exact for proper break-in including iron additive and joe gibbs oil. Smoke pouring out tailpipes on tailpipes while accelerating. Manufacturer said to send back the block back to them to inspect and their conclusion was the oil got contaminated which caused the rings not to set properly which isn't covered under their warranty. Any help would be appreciated.