Re: overheated 1988 150
Before you spend a dime on it, run a compression check and remove heads to inspect cylinders/pistons for damage. Also check cylinder sleeves as they will pull away from block casting if to hot. Also pull divider plate and check for aluminum bridge melting and the poppet for being melted. You will need to replace every gasket on this engine and exhaust housing. For one to get this hot without owner knowing it the hot horn is not installed or sensor wire bad. For parts you can PM me...