Quote:
Originally Posted by RandyMettler
The only thing I cant wrap my mind around is the cooling system is under a lot of pressure and grease is very fluid.
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Your thinking modern, these systems are not pressurized, so very little pressure (unless it has been modified to a later radiator system). About the only pressure is that from the water pumps. The later flatheads did use a low pressure radiator cap, but still far less than a modern engine.