Good eveing all , I have a supermajor im currently stripping the engine down for a rebuild , the engine block is red oxide primer with grey on the top , the oil filter housing matches this also but everything elce bolted onto the block is blue / red oxide ? Never seen a super major engine painted grey also the engine number starts with an S and I've had several people who claim to be in the know say it docent match anything in their books on engine numbers , please any information would be so helpful