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Message: [QUOTE="Maryland dieselnick, post: 1561767, member: 22661"] From what I got from what the guy in the video was saying that the tool is needed to roll it into a serrated section the cup goes into the head. While the 7.3 head has no serrated section in the head, International chose to use brass for that engine. Their are thermal dynamic differences between brass and stainless. How much that played into their decision, I do not know. What I do know with regards to something that could dramatically negatively effect thermal dynamics is; on Riff Raff’s ( quite the name) website states that it is thicker in a section and makes it stronger. That’s a real issue. They also push their tool kit stating the traditional tap style removal tool sends brass shavings down into the cylinders. If you drop a dime down into the cup before using a tap type removal tool, that DOES NOT HAPPEN. I’ve come behind a lot of DIYers that did cups with Riff Raff removal installation tools. The crank down process did not always completely seat the cup as it is hard to tell if it’s completely seated even when using a torque wrench as drag going in will vary with cups and bores. If you use the Rosewood Style driver, you hear and feel the thud of the cup bottoming out [/QUOTE]

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