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Message: [QUOTE="Luke@MillerPerformance, post: 1254138, member: 12303"] One of two things is going to shut your truck down at those rpms: 1. the cam gear will decide it wants off the cam (they are press fit) and take out the cam sensor. Also the valves will hit the pistons. 2. It's a 7.3, it's not well balanced from the factory, and it has PMRs. You're going to punch some holes through the sides of the block. Those guys with Cummins spinning 5K are not stock. Most likely the are 6.4 motors. 6.7 crank with custom rods in a 5.9 blocks. This corrects the rod angle to allow the high rpms. You need to remember, a 7.3 is a big motor to be spinning that fast. That extra 1.4 liters of displacement makes a big difference. Those clutch dumps have caused piston contact. Just because it still runs doesn't mean the haven't hit. I've got a set here to prove it. [/QUOTE]

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