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It often develops leaks, which means a loss of coolant that leads to overheating. The stock radiator is one of the parts that should be replaced with an aftermarket 6.4 radiator. One of the more infamous problems on the 6.4 Powerstroke is its weak pistons that were prone to early cracking. A cracked piston allows extra air into the cylinder, which then decreases the compression ratio. This results in a loss of power and can only be fixed by replacing the pistons. Numerous problems plagued the 6.4 Pow