[Bill Wells]

how accurate is your temp gauge ?ie, , you said it ran hot but did not boil over . one school says if it doesnt puke, it is not hot .

what fan do you have and what year mustang ? 67 - 390 ?

on my 65 Mustang with .040 bored K code modified motor I have the stock radiator and hi-po shroud but added a 6 blade clutch fan - which really helped cool it down ( 4 blade was standard ) . On my 57 TBird i added a 6 blade clutch fan replacing a stock 4 blade and a large back up electric pusher fan with automatic thermostat - those old 312 Y block early birds all run hot, no longer runs hot.

the many Mustang parts suppliers offer a variety of high output aluminum radiators that are an easy bolt in - but I would not jump too quick before you determine if the engine is really running hot - and you can somewhat test /compare your gauge by buying or borrowing an infra red heat thermometer and shoot various engine areas to see what the temps really are . also, double your anti freeze to make sure it is fresh and at a 50/50 level - too much anti freeze will make it run hotter too . good luck . bill