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Originally Posted by DIGItonium
So with the power dropping off at higher RPM, is it because we're exceeding the flow limit of the heads? Charles, have you started rebuilding the valvetrain utilizing dual springs and upgraded valves?
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Engine manufacturers have to compromise what engine speed window they want their engines to perform best in, and construct it to do so. Various intake manifold specifications, camshafts, valve event timing, header size/shape/style, among several other things are what determine the engines powerband. These are the same things you have to work on changing around if you want to move the engines powerband from where it was originally intended. Technologies like VVEL allow some useful and added flexibility, but until all the meaningful specs of an engine use dynamic technology, there will always be performance sacrifices at varying engine speeds. So there is no solid flow limits to the heads, its all in how you use them.
For my heads, my built engine will be using HR heads as to eliminate the VVEL system.