I've had my 54 3100 w/235 for 4yrs...never had a cooling problem or any leaks..it's originally a down south hot weather truck..anyway, was fixin to do a cooling system flush and looked at the radiator cap...14#?..everything i see in my books says 4#..anyone have a clue why it all works well with the cap i have, and should i change to a 4#? Sure would appreciate a response, gonna be headed to the parts store for some other things...thanks