I don't have any hard and fast before and after figures, however I can feel a noticeable difference in power and the way the engine wants to keep pulling smoothly when accelerating on the highway. I found out that if it's on the bottom, the rockers don't line up on the valve stem very well. I found that a mirror to check the alignment of the rear bank is essential, and paying attention to make sure the flat spot on the fulcrum is at the top. Parts soaking up cam lube (supplied by ZillaMotorsport) I would have eventually figured it out but there would have been a lot of head scratching and cursing in the meantime. For those who have done a lot of engine work, it may have been simple but for me, not so much. If I had tried to install these at home by myself, being a first timer at this, I would have been very frustrated. The only applicable tid bit of info that I could take from the instructions was the torque value for the re-usable bolts. The instructions that come with the kit are basically non existent for our application. They look great (even though you can't see them under the valve cover), all the moving parts work very smoothly, everything fit perfectly. I love the fit and finish of these things.
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