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Message: [QUOTE="MeTo, post: 1506816, member: 23681"] I searched the net, talked to Mahle and Hastings. A large second ring gap is supposed to help prevent top ring flutter and allows some compression to leak by the second ring to help prevent oil from migrating into the combustion chamber. For Navistar, it's all about trying to control emissions. It's why Ford discontinued the 7.3 after 2003. For me, I vented my blow by to the exhaust. As for top ring flutter, most agree it occurs around 8000 rpm. So in the end, for my use of the engine, the second ring will have the same gap as the top ring. The local machine shop who does a lot of work for the local dealers and most of the track engines. He has no reservations with a close second ring gap. We modify most things on this engine. Why not the ring end gap? [/QUOTE]

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