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Now that we are all serious again!
I am just an amature but I have had experience-cost me money. The roller lifters are very good today and the cams are even better because of competer modeling. It is lack of experience and available parts in picking the whole package that is 99.9% of the problem. We essentially have 50 year old engines and we stuff a new style (roller) cam throw in some valve springs that Jesus can hardle move with some push rods the size of a pensel because of the intake port size and top it off with heavy valves and huge ineffecient rockers and a marginal oiling system. It is the system that is the issue! Not really the particular parts. To get the work out of the cool cams you need the huge spring pressure- the rest is the real problem and like a chain the weekest link fails. The secret to the really big power as we all now is the valve train- look at any Jab car. No pushrods, springs you can push with your hand. The lighter the valve train the less spring you need- the more power you have with less problems.
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