OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines 92 B&S why does one head bolt look different?

Thanks AVB
I have a feeling this was not the original motor as it's a 92 model and I don't think Rover were still making the Thoroughbred cylinder mower at that point. May have come off something else.
Cheers