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Power Strokes
6.4 Aftermarket
Hardened valve seats.
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[QUOTE="B585Ford, post: 435268, member: 5497"] Thanks. Related to this build (the OP uses his truck for heavy towing), one thing that has always had me concerned was when I am towing and climbing a long hill, the heads have to get pretty hot. If I immediately start descending when I get to the top of the hill, my EGTS drop quickly. Obviously the change in temps don't happen as quick as if you could throw cold water on them, but I was curious if the drop is sudden enough to promote cracking. [/QUOTE]
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6.4 Aftermarket
Hardened valve seats.
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