https://cnrautoparts.com/2008-....2010-ford-powerstrok
It’s what happens after you’ve added power or racked up a ton of miles with said power that most 6.4L owners encounter problems—namely in the form of blown head gaskets and cracked pistons. As far as horsepower thresholds are concerned, the factory head bolts tend to stretch around the 600rwhp mark, and sometimes sooner when prolonged abuse is present. The cracked piston phenomenon is a bit more tricky, with some living in high horsepower applications for years while others bi
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