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It's about weight and flex of a connecting rod
Guys the differents between rods is that and I beam is stronger and far less flex. The H rod has more flex but is lighter. depending on rpm range is which rod you go with. Less weight, easier and faster for rpm spin up. I run "H" rods and have had no problems with them. I do limit my motors to 6,500 rpms. If I was looking for more rpms, I would go to an "I" rod. It's all about the application. rod big end size too. Honda 1.88 rods are a trick to run but know of guys doing this with a light piston. Rick L.
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