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Did the tuner have no comment on why the car falls on it's face there at what looks like around 5800rpm?
What valve springs are you using and how old are they?
Didn't say anything just to fix it... And my friend said maybe its my pushrods wrong Length I have 7.4 pushrods ls7 lifters and .650 springs that are only 6 months old before ls7 lifters I made 360