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Message: <blockquote data-quote="Andrew95GTS" data-source="post: 568981" data-attributes="member: 10951">Of course the head does not determine the type of cam you use, the spring does and that is what I was saying. Hydraulic roller cams need more spring/seat pressure which in turn means you have to run a stiffer spring! That is why there are different versions of the 170cc Twisted Wedge head, one for hydraulic and one for hydraulic roller. These heads have have SPRINGS designed for a HYDRAULIC FLAT TAPPET cam. The cam dictates what spring you need. You can cut down on the height of the valve spring to increase the pressure but in turn it will limit you even for on max lift. I was thinking about these heads but by the time you buy some upgraded springs with enough pressure for hydraulic roller, might as well pay a little extra and buy a set of AFRs.SEAT PRESSURE MAKES THE DIFFERENCE!</blockquote>