I hate it for ya mikael.. My 408 has ss steel rockers. It pulls hard all the way to 6200, Then I put in a 6800 chip. I have not hit it yet. I was thinking about a 7000 limit... but NOW, maybe 6800 is enough. Coil bind could put a lot of stress on the rocker. That is why the behive springs allow more compession of the spring as the center area of the spring is larger diameter than the top and bottom areas.
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