408 wont rev past 4500

[brainsboy]

Its all new. I have maybe around 300miles on it.

Are you sure about the valve adjustment being loose will cause the top end power loss? Let me tell what happen. I had this problem originaly so I went to a friends house that does circle track. I myself have always used solid cams so know nothing about hyd cams, infact I havent used a hydrolic cam since I was 17. He told me that it seemed as I had my valves too tight. He told me to adjust all the valves at .001", I tried to argue but he insisted that I adjust them all at .001" and from there to turn the nuts a 1/8" turn to snug them up. So thats where I am set right now. I also noted that the previous settings 5 were 3/4"turns and 3 were almost 1-1/2" turns. I agreed to this mostly because I have a High volume pump, and thought maybe the high oil volume was making the lifters pump up. By the way Im running the Crane hyd roller link bar lifters, that cost me about 500$

The question is do you guys really think running them loose will cause top end power loss? How are they supposed to be adjusted? And would 3/4 to 1-1/2 turns perhaps be too tight causing the same problem I had before?


Yes it winds up ok with no load, also I noticed it runs so much better cold then after its warm. If that makes a difference at all. Im running NGK heat range 9, I tried everything from .035 to .050 all with the same results, I tried heat range 7,8 also same thing